IDEA-346782 QuickDoc: correct line spacing - add ParagraphViewEx, add opens for javax.swing.text

GitOrigin-RevId: bddc47d3a66c1964ea5162e20e7ec45eae645b95
2025-12-13 06:59:44 +07:00 · 2024-02-20 18:20:49 +01:00
parent 23173def8a
commit e5d37f2016
11 changed files with 522 additions and 12 deletions
--- a/.idea/runConfigurations/IDEA.xml
+++ b/.idea/runConfigurations/IDEA.xml
@@ -7,7 +7,7 @@
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+++ b/.idea/runConfigurations/IDEA_K2.xml
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+    <option name="VM_PARAMETERS" value="-Xmx512m -XX:ReservedCodeCacheSize=240m -XX:SoftRefLRUPolicyMSPerMB=50 -XX:MaxJavaStackTraceDepth=10000 -ea -Dsun.io.useCanonCaches=false -Dapple.laf.useScreenMenuBar=true -Dsun.awt.disablegrab=true -Didea.jre.check=true -Didea.is.internal=true -Didea.debug.mode=true -Djdk.attach.allowAttachSelf -Dfus.internal.test.mode=true -Dkotlinx.coroutines.debug=off -Djdk.module.illegalAccess.silent=true -Didea.config.path=../config/idea-py -Didea.system.path=../system/idea-py -Didea.initially.ask.config=true --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/java.lang.reflect=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.text=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/jdk.internal.vm=ALL-UNNAMED --add-opens=java.base/sun.nio.ch=ALL-UNNAMED --add-opens=java.desktop/com.apple.eawt.event=ALL-UNNAMED --add-opens=java.desktop/com.apple.eawt=ALL-UNNAMED --add-opens=java.desktop/com.apple.laf=ALL-UNNAMED --add-opens=java.desktop/com.sun.java.swing.plaf.gtk=ALL-UNNAMED --add-opens=java.desktop/java.awt.dnd.peer=ALL-UNNAMED --add-opens=java.desktop/java.awt.event=ALL-UNNAMED --add-opens=java.desktop/java.awt.image=ALL-UNNAMED --add-opens=java.desktop/java.awt.peer=ALL-UNNAMED --add-opens=java.desktop/java.awt=ALL-UNNAMED --add-opens=java.desktop/javax.swing.plaf.basic=ALL-UNNAMED --add-opens=java.desktop/javax.swing.text=ALL-UNNAMED --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED --add-opens=java.desktop/javax.swing=ALL-UNNAMED --add-opens=java.desktop/sun.awt.X11=ALL-UNNAMED --add-opens=java.desktop/sun.awt.datatransfer=ALL-UNNAMED --add-opens=java.desktop/sun.awt.image=ALL-UNNAMED --add-opens=java.desktop/sun.awt.windows=ALL-UNNAMED --add-opens=java.desktop/sun.awt=ALL-UNNAMED --add-opens=java.desktop/sun.font=ALL-UNNAMED --add-opens=java.desktop/sun.java2d=ALL-UNNAMED --add-opens=java.desktop/sun.lwawt.macosx=ALL-UNNAMED --add-opens=java.desktop/sun.lwawt=ALL-UNNAMED --add-opens=java.desktop/sun.swing=ALL-UNNAMED --add-opens=jdk.attach/sun.tools.attach=ALL-UNNAMED --add-opens=jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-opens=jdk.jdi/com.sun.tools.jdi=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED -Djava.system.class.loader=com.intellij.util.lang.PathClassLoader" />
    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/bin" />
    <RunnerSettings RunnerId="Debug">
      <option name="DEBUG_PORT" value="" />
--- a/.idea/runConfigurations/PyCharm.xml
+++ b/.idea/runConfigurations/PyCharm.xml
@@ -6,7 +6,7 @@
    <option name="MAIN_CLASS_NAME" value="com.intellij.idea.Main" />
    <module name="intellij.pycharm.community.main" />
    <shortenClasspath name="ARGS_FILE" />
-    <option name="VM_PARAMETERS" value="-Xmx512m -XX:ReservedCodeCacheSize=240m -XX:SoftRefLRUPolicyMSPerMB=50 -XX:MaxJavaStackTraceDepth=10000 -ea -Dsun.io.useCanonCaches=false -Dapple.laf.useScreenMenuBar=true -Dsun.awt.disablegrab=true -Didea.jre.check=true -Didea.is.internal=true -Didea.debug.mode=true -Djdk.attach.allowAttachSelf -Dfus.internal.test.mode=true -Dkotlinx.coroutines.debug=off -Djdk.module.illegalAccess.silent=true --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/java.lang.reflect=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.text=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/jdk.internal.vm=ALL-UNNAMED --add-opens=java.base/sun.nio.ch=ALL-UNNAMED --add-opens=java.desktop/com.apple.eawt.event=ALL-UNNAMED --add-opens=java.desktop/com.apple.eawt=ALL-UNNAMED --add-opens=java.desktop/com.apple.laf=ALL-UNNAMED --add-opens=java.desktop/com.sun.java.swing.plaf.gtk=ALL-UNNAMED --add-opens=java.desktop/java.awt.dnd.peer=ALL-UNNAMED --add-opens=java.desktop/java.awt.event=ALL-UNNAMED --add-opens=java.desktop/java.awt.image=ALL-UNNAMED --add-opens=java.desktop/java.awt.peer=ALL-UNNAMED --add-opens=java.desktop/java.awt=ALL-UNNAMED --add-opens=java.desktop/javax.swing.plaf.basic=ALL-UNNAMED --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED --add-opens=java.desktop/javax.swing=ALL-UNNAMED --add-opens=java.desktop/sun.awt.X11=ALL-UNNAMED --add-opens=java.desktop/sun.awt.datatransfer=ALL-UNNAMED --add-opens=java.desktop/sun.awt.image=ALL-UNNAMED --add-opens=java.desktop/sun.awt.windows=ALL-UNNAMED --add-opens=java.desktop/sun.awt=ALL-UNNAMED --add-opens=java.desktop/sun.font=ALL-UNNAMED --add-opens=java.desktop/sun.java2d=ALL-UNNAMED --add-opens=java.desktop/sun.lwawt.macosx=ALL-UNNAMED --add-opens=java.desktop/sun.lwawt=ALL-UNNAMED --add-opens=java.desktop/sun.swing=ALL-UNNAMED --add-opens=jdk.attach/sun.tools.attach=ALL-UNNAMED --add-opens=jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-opens=jdk.jdi/com.sun.tools.jdi=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED -Didea.platform.prefix=PyCharmCore -Didea.config.path=../config/pycharm -Didea.system.path=../system/pycharm" />
+    <option name="VM_PARAMETERS" value="-Xmx512m -XX:ReservedCodeCacheSize=240m -XX:SoftRefLRUPolicyMSPerMB=50 -XX:MaxJavaStackTraceDepth=10000 -ea -Dsun.io.useCanonCaches=false -Dapple.laf.useScreenMenuBar=true -Dsun.awt.disablegrab=true -Didea.jre.check=true -Didea.is.internal=true -Didea.debug.mode=true -Djdk.attach.allowAttachSelf -Dfus.internal.test.mode=true -Dkotlinx.coroutines.debug=off -Djdk.module.illegalAccess.silent=true --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/java.lang.reflect=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.text=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/jdk.internal.vm=ALL-UNNAMED --add-opens=java.base/sun.nio.ch=ALL-UNNAMED --add-opens=java.desktop/com.apple.eawt.event=ALL-UNNAMED --add-opens=java.desktop/com.apple.eawt=ALL-UNNAMED --add-opens=java.desktop/com.apple.laf=ALL-UNNAMED --add-opens=java.desktop/com.sun.java.swing.plaf.gtk=ALL-UNNAMED --add-opens=java.desktop/java.awt.dnd.peer=ALL-UNNAMED --add-opens=java.desktop/java.awt.event=ALL-UNNAMED --add-opens=java.desktop/java.awt.image=ALL-UNNAMED --add-opens=java.desktop/java.awt.peer=ALL-UNNAMED --add-opens=java.desktop/java.awt=ALL-UNNAMED --add-opens=java.desktop/javax.swing.plaf.basic=ALL-UNNAMED --add-opens=java.desktop/javax.swing.text=ALL-UNNAMED --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED --add-opens=java.desktop/javax.swing=ALL-UNNAMED --add-opens=java.desktop/sun.awt.X11=ALL-UNNAMED --add-opens=java.desktop/sun.awt.datatransfer=ALL-UNNAMED --add-opens=java.desktop/sun.awt.image=ALL-UNNAMED --add-opens=java.desktop/sun.awt.windows=ALL-UNNAMED --add-opens=java.desktop/sun.awt=ALL-UNNAMED --add-opens=java.desktop/sun.font=ALL-UNNAMED --add-opens=java.desktop/sun.java2d=ALL-UNNAMED --add-opens=java.desktop/sun.lwawt.macosx=ALL-UNNAMED --add-opens=java.desktop/sun.lwawt=ALL-UNNAMED --add-opens=java.desktop/sun.swing=ALL-UNNAMED --add-opens=jdk.attach/sun.tools.attach=ALL-UNNAMED --add-opens=jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-opens=jdk.jdi/com.sun.tools.jdi=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED -Didea.platform.prefix=PyCharmCore -Didea.config.path=../config/pycharm -Didea.system.path=../system/pycharm" />
    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/bin" />
    <RunnerSettings RunnerId="Debug">
      <option name="DEBUG_PORT" value="" />
--- a/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationEditorPane.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationEditorPane.java
@@ -84,6 +84,7 @@ public abstract class DocumentationEditorPane extends JEditorPane implements Dis
      .replaceViewFactoryExtensions(getIconsExtension(iconResolver),
                                    Extensions.BASE64_IMAGES,
                                    Extensions.INLINE_VIEW_EX,
+                                    Extensions.PARAGRAPH_VIEW_EX,
                                    Extensions.FIT_TO_WIDTH_IMAGES,
                                    Extensions.WBR_SUPPORT)
      .withFontResolver(EditorCssFontResolver.getGlobalInstance()).build();
--- a/platform/lang-impl/src/com/intellij/lang/documentation/QuickDocHighlightingHelper.kt
+++ b/platform/lang-impl/src/com/intellij/lang/documentation/QuickDocHighlightingHelper.kt
@@ -283,7 +283,7 @@ object QuickDocHighlightingHelper {
      "h2 { font-size: ${fontSize + 6}}",
      "h1 { font-size: ${fontSize + 8}}",
      "h1, h2, h3, h4, h5, h6 {margin: 0 0 0 0; padding: 0 0 ${spacing}px 0; }",
-      "p { margin: 0 0 0 0; padding: 0 0 ${spacing}px 0;}",
+      "p { margin: 0 0 0 0; padding: 0 0 ${spacing}px 0; line-height: 125%;}",
      "ul { margin: 0 0 0 ${scale(10)}px; padding: 0 0 ${spacing}px 0;}",
      "ol { margin: 0 0 0 ${scale(20)}px; padding: 0 0 ${spacing}px 0;}",
      "li { padding: ${scale(1)}px 0 ${scale(2)}px 0; }",
--- a/platform/platform-impl/resources/META-INF/OpenedPackages.txt
+++ b/platform/platform-impl/resources/META-INF/OpenedPackages.txt
@@ -29,6 +29,7 @@
 --add-opens=java.desktop/java.awt.font=ALL-UNNAMED
 --add-opens=java.desktop/javax.swing=ALL-UNNAMED
 --add-opens=java.desktop/javax.swing.plaf.basic=ALL-UNNAMED
+--add-opens=java.desktop/javax.swing.text=ALL-UNNAMED
 --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED
 --add-opens=java.desktop/sun.awt.X11=ALL-UNNAMED
 --add-opens=java.desktop/sun.awt.datatransfer=ALL-UNNAMED
--- a/platform/util/ui/src/com/intellij/util/ui/ExtendableHTMLViewFactory.kt
+++ b/platform/util/ui/src/com/intellij/util/ui/ExtendableHTMLViewFactory.kt
@@ -6,10 +6,10 @@ import com.intellij.openapi.util.IconLoader
 import com.intellij.openapi.util.text.HtmlChunk
 import com.intellij.ui.scale.JBUIScale
 import com.intellij.util.text.nullize
+import com.intellij.util.ui.html.*
 import com.intellij.util.ui.html.FitToWidthImageView
 import com.intellij.util.ui.html.HiDpiScalingImageView
 import com.intellij.util.ui.html.InlineViewEx
-import com.intellij.util.ui.html.WbrView
 import java.awt.*
 import java.awt.image.BufferedImage
 import java.io.ByteArrayInputStream
@@ -49,7 +49,7 @@ class ExtendableHTMLViewFactory internal constructor(
  companion object {
    @JvmField
    val DEFAULT_EXTENSIONS: List<Extension> = listOf(Extensions.ICONS, Extensions.BASE64_IMAGES, Extensions.HIDPI_IMAGES,
-                                                     Extensions.INLINE_VIEW_EX, Extensions.WBR_SUPPORT)
+                                                     Extensions.INLINE_VIEW_EX, Extensions.WBR_SUPPORT, Extensions.PARAGRAPH_VIEW_EX)

    @JvmField
    val DEFAULT: ExtendableHTMLViewFactory = ExtendableHTMLViewFactory(DEFAULT_EXTENSIONS)
@@ -115,11 +115,17 @@ class ExtendableHTMLViewFactory internal constructor(
    val WORD_WRAP: Extension = WordWrapExtension()

    /**
-     * Supports rendering of inline elements, like <span>, with paddings and margins
+     * Supports rendering of inline elements, like <span>, with paddings, margins and rounded corners.
     */
    @JvmField
    val INLINE_VIEW_EX: Extension = InlineViewExExtension()

+    /**
+     * Supports line-height property (%, px and no-unit) in paragraphs.
+     */
+    @JvmField
+    val PARAGRAPH_VIEW_EX: Extension = ParagraphViewExExtension()
+
    /**
     * Renders images with proper scaling according to sysScale
     */
@@ -388,6 +394,17 @@ class ExtendableHTMLViewFactory internal constructor(
    }
  }

+  private class ParagraphViewExExtension : Extension {
+    override fun invoke(element: Element, view: View): View? {
+      if (view.javaClass != ParagraphView::class.java) return null
+      val attrs = view.attributes
+      if (attrs.getAttribute(CSS.Attribute.LINE_HEIGHT) != null) {
+        return ParagraphViewEx(element)
+      }
+      return null
+    }
+  }
+
  private class FitToWidthImageViewExtension : Extension {
    override fun invoke(element: Element, view: View): View? =
      if (view is ImageView) FitToWidthImageView(element) else null
--- a/platform/util/ui/src/com/intellij/util/ui/html/ParagraphViewEx.kt
+++ b/platform/util/ui/src/com/intellij/util/ui/html/ParagraphViewEx.kt
@@ -0,0 +1,445 @@
+// Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package com.intellij.util.ui.html
+
+import com.intellij.util.asSafely
+import java.awt.Shape
+import java.awt.Toolkit
+import java.util.*
+import javax.swing.SizeRequirements
+import javax.swing.text.*
+import javax.swing.text.Position.Bias
+import javax.swing.text.html.CSS
+import javax.swing.text.html.ParagraphView
+import kotlin.math.max
+import kotlin.math.min
+
+/**
+ * Supports line-height (%, px and no-unit) property in paragraphs.
+ */
+class ParagraphViewEx(elem: Element) : ParagraphView(elem) {
+
+  @Suppress("ProtectedInFinal")
+  @JvmField
+  protected var fixedLineHeight: Float? = null
+
+  @Suppress("ProtectedInFinal")
+  @JvmField
+  protected var scaledLineHeight: Float? = null
+
+  @Suppress("ProtectedInFinal")
+  @JvmField
+  protected var fontLineHeight: Int? = null
+
+  @Suppress("ProtectedInFinal")
+  @JvmField
+  protected var justification: Int = 0
+
+  override fun setPropertiesFromAttributes() {
+    super.setPropertiesFromAttributes()
+
+    val lineHeight = attributes.getAttribute(CSS.Attribute.LINE_HEIGHT)
+      ?.asSafely<String>()
+      ?.trim()
+
+    when {
+      lineHeight == null -> {}
+      lineHeight.endsWith("%") ->
+        lineHeight
+          .removeSuffix("%")
+          .toFloatOrNull()
+          ?.let { scaledLineHeight = it / 100f }
+      lineHeight.endsWith("px") ->
+        lineHeight
+          .removeSuffix("px")
+          .toFloatOrNull()
+          ?.let { fixedLineHeight = it }
+      else ->
+        lineHeight
+          .toFloatOrNull()
+          ?.let { scaledLineHeight = it }
+    }
+  }
+
+  override fun calculateMinorAxisRequirements(axis: Int, r: SizeRequirements?): SizeRequirements {
+    val font = document.asSafely<StyledDocument>()?.getFont(attributes)
+               ?: container?.font
+    font
+      ?.let { container?.getFontMetrics(it) ?: Toolkit.getDefaultToolkit().getFontMetrics(font) }
+      .let { fontLineHeight = it?.height }
+    return super.calculateMinorAxisRequirements(axis, r)
+  }
+
+  override fun createRow(): View {
+    return Row(element)
+  }
+
+  inner class Row internal constructor(elem: Element) : BoxView(elem, X_AXIS) {
+    /**
+     * This is reimplemented to do nothing since the
+     * paragraph fills in the row with its needed
+     * children.
+     */
+    override fun loadChildren(f: ViewFactory) {
+    }
+
+    /**
+     * Fetches the attributes to use when rendering.  This view
+     * isn't directly responsible for an element so it returns
+     * the outer classes attributes.
+     */
+    override fun getAttributes(): AttributeSet? {
+      val p = parent
+      return if ((p != null)) p.attributes else null
+    }
+
+    override fun getAlignment(axis: Int): Float {
+      if (axis == X_AXIS) {
+        when (justification) {
+          StyleConstants.ALIGN_LEFT -> return 0f
+          StyleConstants.ALIGN_RIGHT -> return 1f
+          StyleConstants.ALIGN_CENTER -> return 0.5f
+          StyleConstants.ALIGN_JUSTIFIED -> {
+            var rv = 0.5f
+            //if we can justifiy the content always align to
+            //the left.
+            if (isJustifiableDocument) {
+              rv = 0f
+            }
+            return rv
+          }
+        }
+      }
+      return super.getAlignment(axis)
+    }
+
+    /**
+     * Provides a mapping from the document model coordinate space
+     * to the coordinate space of the view mapped to it.  This is
+     * implemented to let the superclass find the position along
+     * the major axis and the allocation of the row is used
+     * along the minor axis, so that even though the children
+     * are different heights they all get the same caret height.
+     *
+     * @param pos the position to convert
+     * @param a the allocated region to render into
+     * @return the bounding box of the given position
+     * @exception BadLocationException  if the given position does not represent a
+     * valid location in the associated document
+     * @see View.modelToView
+     */
+    @Throws(BadLocationException::class)
+    override fun modelToView(pos: Int, a: Shape, b: Bias): Shape {
+      var r = a.bounds
+      val v = getViewAtPosition(pos, r)
+      if ((v != null) && (!v.element.isLeaf)) {
+        // Don't adjust the height if the view represents a branch.
+        return super.modelToView(pos, a, b)
+      }
+      r = a.bounds
+      val height = r.height
+      val y = r.y
+      val loc = super.modelToView(pos, a, b)
+      val bounds = loc.bounds2D
+      bounds.setRect(bounds.x, y.toDouble(), bounds.width, height.toDouble())
+      return bounds
+    }
+
+    /**
+     * Range represented by a row in the paragraph is only
+     * a subset of the total range of the paragraph element.
+     */
+    override fun getStartOffset(): Int {
+      var offs = Int.MAX_VALUE
+      val n = viewCount
+      for (i in 0 until n) {
+        val v = getView(i)
+        offs = min(offs.toDouble(), v.startOffset.toDouble()).toInt()
+      }
+      return offs
+    }
+
+    override fun getEndOffset(): Int {
+      var offs = 0
+      val n = viewCount
+      for (i in 0 until n) {
+        val v = getView(i)
+        offs = max(offs.toDouble(), v.endOffset.toDouble()).toInt()
+      }
+      return offs
+    }
+
+    /**
+     * Perform layout for the minor axis of the box (i.e. the
+     * axis orthogonal to the axis that it represents).  The results
+     * of the layout should be placed in the given arrays which represent
+     * the allocations to the children along the minor axis.
+     *
+     *
+     * This is implemented to do a baseline layout of the children
+     * by calling BoxView.baselineLayout.
+     *
+     * @param targetSpan the total span given to the view, which
+     * would be used to layout the children.
+     * @param axis the axis being layed out.
+     * @param offsets the offsets from the origin of the view for
+     * each of the child views.  This is a return value and is
+     * filled in by the implementation of this method.
+     * @param spans the span of each child view.  This is a return
+     * value and is filled in by the implementation of this method.
+     * @return the offset and span for each child view in the
+     * offsets and spans parameters
+     */
+    override fun layoutMinorAxis(targetSpan: Int, axis: Int, offsets: IntArray, spans: IntArray) {
+      baselineLayout(targetSpan, axis, offsets, spans)
+    }
+
+    override fun calculateMinorAxisRequirements(axis: Int,
+                                                r: SizeRequirements?): SizeRequirements {
+      return baselineRequirements(axis, r)
+    }
+
+
+    private val isLastRow: Boolean
+      get() {
+        var parent: View
+        return ((getParent().also { parent = it }) == null
+                || this === parent.getView(parent.viewCount - 1))
+      }
+
+    private val isBrokenRow: Boolean
+      get() {
+        var rv = false
+        val viewsCount = viewCount
+        if (viewsCount > 0) {
+          val lastView = getView(viewsCount - 1)
+          if (lastView.getBreakWeight(X_AXIS, 0f, 0f) >=
+              ForcedBreakWeight) {
+            rv = true
+          }
+        }
+        return rv
+      }
+
+    private val isJustifiableDocument: Boolean
+      get() = (true != document.getProperty("i18n"))
+
+    private val isJustifyEnabled: Boolean
+      /**
+       * Whether we need to justify this `Row`.
+       * At this time (jdk1.6) we support justification on for non
+       * 18n text.
+       *
+       * @return `true` if this `Row` should be justified.
+       */
+      get() {
+        var ret = (justification == StyleConstants.ALIGN_JUSTIFIED)
+
+        //no justification for i18n documents
+        ret = ret && isJustifiableDocument
+
+        //no justification for the last row
+        ret = ret && !isLastRow
+
+        //no justification for the broken rows
+        ret = ret && !isBrokenRow
+
+        return ret
+      }
+
+
+    //Calls super method after setting spaceAddon to 0.
+    //Justification should not affect MajorAxisRequirements
+    override fun calculateMajorAxisRequirements(axis: Int,
+                                                r: SizeRequirements?): SizeRequirements {
+      val oldJustficationData = justificationData
+      justificationData = null
+      val ret = super.calculateMajorAxisRequirements(axis, r)
+      if (isJustifyEnabled) {
+        justificationData = oldJustficationData
+      }
+      return ret
+    }
+
+    override fun layoutMajorAxis(targetSpan: Int, axis: Int,
+                                 offsets: IntArray, spans: IntArray) {
+      val oldJustficationData = justificationData
+      justificationData = null
+      super.layoutMajorAxis(targetSpan, axis, offsets, spans)
+      if (!isJustifyEnabled) {
+        return
+      }
+
+      var currentSpan = 0
+      for (span in spans) {
+        currentSpan += span
+      }
+      if (currentSpan == targetSpan) {
+        //no need to justify
+        return
+      }
+
+      // we justify text by enlarging spaces by the {@code spaceAddon}.
+      // justification is started to the right of the rightmost TAB.
+      // leading and trailing spaces are not extendable.
+      //
+      // GlyphPainter1 uses
+      // justificationData
+      // for all painting and measurement.
+      var extendableSpaces = 0
+      var startJustifiableContent = -1
+      var endJustifiableContent = -1
+      var lastLeadingSpaces = 0
+
+      val rowStartOffset = startOffset
+      val rowEndOffset = endOffset
+      val spaceMap = IntArray(rowEndOffset - rowStartOffset)
+      Arrays.fill(spaceMap, 0)
+      for (i in viewCount - 1 downTo 0) {
+        val view = getView(i)
+        if (view is GlyphView) {
+          val justificationInfo = view.getJustificationInfo(rowStartOffset)
+          val viewStartOffset = view.getStartOffset()
+          val offset = viewStartOffset - rowStartOffset
+          for (j in 0 until justificationInfo.spaceMap.length()) {
+            if (justificationInfo.spaceMap[j]) {
+              spaceMap[j + offset] = 1
+            }
+          }
+          if (startJustifiableContent > 0) {
+            if (justificationInfo.end >= 0) {
+              extendableSpaces += justificationInfo.trailingSpaces
+            }
+            else {
+              lastLeadingSpaces += justificationInfo.trailingSpaces
+            }
+          }
+          if (justificationInfo.start >= 0) {
+            startJustifiableContent =
+              justificationInfo.start + viewStartOffset
+            extendableSpaces += lastLeadingSpaces
+          }
+          if (justificationInfo.end >= 0
+              && endJustifiableContent < 0) {
+            endJustifiableContent =
+              justificationInfo.end + viewStartOffset
+          }
+          extendableSpaces += justificationInfo.contentSpaces
+          lastLeadingSpaces = justificationInfo.leadingSpaces
+          if (justificationInfo.hasTab) {
+            break
+          }
+        }
+      }
+      if (extendableSpaces <= 0) {
+        //there is nothing we can do to justify
+        return
+      }
+      val adjustment = targetSpan - currentSpan
+      val spaceAddon = adjustment / extendableSpaces
+      var spaceAddonLeftoverEnd = -1
+      var i = startJustifiableContent - rowStartOffset
+      var leftover = adjustment - spaceAddon * extendableSpaces
+      while (leftover > 0
+      ) {
+        spaceAddonLeftoverEnd = i
+        leftover -= spaceMap[i]
+        i++
+      }
+      if (spaceAddon > 0 || spaceAddonLeftoverEnd >= 0) {
+        justificationData = if ((oldJustficationData != null)
+        ) oldJustficationData
+        else IntArray(END_JUSTIFIABLE + 1)
+        justificationData!![SPACE_ADDON] = spaceAddon
+        justificationData!![SPACE_ADDON_LEFTOVER_END] =
+          spaceAddonLeftoverEnd
+        justificationData!![START_JUSTIFIABLE] =
+          startJustifiableContent - rowStartOffset
+        justificationData!![END_JUSTIFIABLE] =
+          endJustifiableContent - rowStartOffset
+        super.layoutMajorAxis(targetSpan, axis, offsets, spans)
+      }
+    }
+
+    //for justified row we assume the maximum horizontal span
+    //is MAX_VALUE.
+    override fun getMaximumSpan(axis: Int): Float {
+      val ret = if (X_AXIS == axis
+                    && isJustifyEnabled) {
+        Float.MAX_VALUE
+      }
+      else {
+        super.getMaximumSpan(axis)
+      }
+      return ret
+    }
+
+    /**
+     * Fetches the child view index representing the given position in
+     * the model.
+     *
+     * @param pos the position &gt;= 0
+     * @return  index of the view representing the given position, or
+     * -1 if no view represents that position
+     */
+    override fun getViewIndexAtPosition(pos: Int): Int {
+      // This is expensive, but are views are not necessarily layed
+      // out in model order.
+      if (pos < startOffset || pos >= endOffset) return -1
+      for (counter in viewCount - 1 downTo 0) {
+        val v = getView(counter)
+        if (pos >= v.startOffset &&
+            pos < v.endOffset) {
+          return counter
+        }
+      }
+      return -1
+    }
+
+    /**
+     * Gets the left inset.
+     *
+     * @return the inset
+     */
+    override fun getLeftInset(): Short {
+      var parentView: View
+      var adjustment = 0
+      if ((parent.also { parentView = it }) != null) { //use firstLineIdent for the first row
+        if (this === parentView.getView(0)) {
+          adjustment = firstLineIndent
+        }
+      }
+      return (super.getLeftInset() + adjustment).toShort()
+    }
+
+    override fun getTopInset(): Short {
+      return (super.getTopInset() + lineHeightCorrection / 2).toShort()
+    }
+
+    override fun getBottomInset(): Short {
+      return (super.getBottomInset() + lineHeightCorrection / 2).toShort()
+    }
+
+    private val lineHeightCorrection: Int
+      get() {
+        val expectedLineHeight = scaledLineHeight?.let { it * (fontLineHeight ?: return 0) }
+                                 ?: fixedLineHeight
+                                 ?: return 0
+        val actualLineHeight = minorRequest?.preferred ?: 0
+        return max(0f, expectedLineHeight - actualLineHeight).toInt()
+      }
+
+    private var justificationData: IntArray? = null
+
+  }
+
+  companion object {
+    const val SPACE_ADDON: Int = 0
+    const val SPACE_ADDON_LEFTOVER_END: Int = 1
+    const val START_JUSTIFIABLE: Int = 2
+
+    //this should be the last index in justificationData
+    const val END_JUSTIFIABLE: Int = 3
+  }
+
+
+}
--- a/platform/util/ui/src/com/intellij/util/ui/html/utils.kt
+++ b/platform/util/ui/src/com/intellij/util/ui/html/utils.kt
@@ -3,7 +3,11 @@ package com.intellij.util.ui.html

 import com.intellij.util.ui.JBInsets
 import com.intellij.util.ui.JBUI
+import java.util.*
+import javax.swing.SizeRequirements
 import javax.swing.text.AttributeSet
+import javax.swing.text.BoxView
+import javax.swing.text.GlyphView
 import javax.swing.text.View
 import javax.swing.text.html.CSS
 import javax.swing.text.html.HTMLDocument
@@ -33,11 +37,53 @@ val View.cssMargin: JBInsets
    )
  }

+internal val BoxView.minorRequest: SizeRequirements?
+  get() = minorRequestField.get(this) as? SizeRequirements
+
+internal fun GlyphView.getJustificationInfo(rowStartOffset: Int): JustificationInfo =
+  getJustificationInfo.invoke(this).let {
+    JustificationInfo(
+      JustificationInfoClass.getDeclaredField("start").get(it) as Int,
+      JustificationInfoClass.getDeclaredField("end").get(it) as Int,
+      JustificationInfoClass.getDeclaredField("leadingSpaces").get(it) as Int,
+      JustificationInfoClass.getDeclaredField("contentSpaces").get(it) as Int,
+      JustificationInfoClass.getDeclaredField("trailingSpaces").get(it) as Int,
+      JustificationInfoClass.getDeclaredField("hasTab").get(it) as Boolean,
+      JustificationInfoClass.getDeclaredField("spaceMap").get(it) as BitSet,
+    )
+  }
+
 private fun AttributeSet.getLength(attribute: CSS.Attribute, styleSheet: StyleSheet): Float =
-  cssLength.invoke(css, this, attribute, styleSheet) as Float
+  cssLengthMethod.invoke(css, this, attribute, styleSheet) as Float

 private val css: CSS by lazy(LazyThreadSafetyMode.PUBLICATION) { CSS() }
-private val cssLength by lazy(LazyThreadSafetyMode.PUBLICATION) {
+
+private val cssLengthMethod by lazy(LazyThreadSafetyMode.PUBLICATION) {
  CSS::class.java.getDeclaredMethod("getLength", AttributeSet::class.java, CSS.Attribute::class.java, StyleSheet::class.java)
    .also { it.isAccessible = true }
-}
+}
+
+private val getJustificationInfo by lazy(LazyThreadSafetyMode.PUBLICATION) {
+  GlyphView::class.java.getDeclaredMethod("getJustificationInfo", Int::class.javaPrimitiveType)
+    .also { it.isAccessible = true }
+}
+
+private val minorRequestField by lazy(LazyThreadSafetyMode.PUBLICATION) {
+  BoxView::class.java.getDeclaredField("minorRequest")
+    .also { it.isAccessible = true }
+}
+
+private val JustificationInfoClass by lazy(LazyThreadSafetyMode.PUBLICATION) {
+  GlyphView::class.java.declaredClasses
+    .find { it.simpleName == "JustificationInfo" }!!
+}
+
+internal data class JustificationInfo(
+  val start: Int,
+  val end: Int,
+  val leadingSpaces: Int,
+  val contentSpaces: Int,
+  val trailingSpaces: Int,
+  val hasTab: Boolean,
+  val spaceMap: BitSet,
+)