IDEA-91089 Unmovable splitter: min-size blocks resize

platform/platform-impl/src/com/intellij/openapi/wm/impl/content/ComboContentLayout.java

@@ -73,6 +73,11 @@ class ComboContentLayout extends ContentLayout {
     myComboLabel.setBounds(eachX, eachY, width, bounds.height);
   }
 
+  @Override
+  public int getMinimumWidth() {
+    return myIdLabel != null ? myIdLabel.getPreferredSize().width : 0;
+  }
+
   @Override
   public void paintComponent(Graphics g) {
     if (!isToDrawCombo()) return;

platform/platform-impl/src/com/intellij/openapi/wm/impl/content/ContentLayout.java

@@ -61,6 +61,8 @@ abstract class ContentLayout {
 
   public abstract void rebuild();
 
+  public abstract int getMinimumWidth();
+
   public abstract void contentAdded(ContentManagerEvent event);
 
   public abstract void contentRemoved(ContentManagerEvent event);

platform/platform-impl/src/com/intellij/openapi/wm/impl/content/TabContentLayout.java

@@ -253,6 +253,23 @@ class TabContentLayout extends ContentLayout {
     myLastLayout = data;
   }
 
+  @Override
+  public int getMinimumWidth() {
+    int result = 0;
+    if (myIdLabel != null) {
+      result += myIdLabel.getPreferredSize().width;
+      Insets insets = myIdLabel.getInsets();
+      if (insets != null) {
+        result += insets.left + insets.right;
+      }
+    }
+    if (myLastLayout != null) {
+      result += myLastLayout.moreRectWidth + myLastLayout.requiredWidth;
+      result -= myLastLayout.toLayout.size() > 1 ? myLastLayout.moreRectWidth + 1 : -14;
+    }
+    return result;
+  }
+
   static void dropTab(final LayoutData data, final ContentTabLabel toDropLabel) {
     data.requiredWidth -= (toDropLabel.getPreferredSize().width + 1);
     data.toDrop.add(toDropLabel);

platform/platform-impl/src/com/intellij/openapi/wm/impl/content/ToolWindowContentUi.java

@@ -216,7 +216,8 @@ public class ToolWindowContentUi extends JPanel implements ContentUI, PropertyCh
   }
 
   public Dimension getMinimumSize() {
-    return getPreferredSize();
+    Insets insets = getInsets();
+    return new Dimension(insets.left + insets.right + getCurrentLayout().getMinimumWidth(), super.getMinimumSize().height);
   }
 
   public Dimension getPreferredSize() {