allow disabling margins around annotations in editor gutter

GitOrigin-RevId: f22952150422600c4084d3ad68ad31df78666de6

platform/editor-ui-api/src/com/intellij/openapi/editor/TextAnnotationGutterProvider.java

@@ -71,4 +71,12 @@ public interface TextAnnotationGutterProvider {
    * @see EditorGutter#closeAllAnnotations()
    */
   void gutterClosed();
+
+  /**
+   * If {@code true}, a couple of pixels will be added at both sides of displayed text (if it's not empty),
+   * otherwise the width of annotation will be equal to the width of provided text.
+   */
+  default boolean useMargin() {
+    return true;
+  }
 }

platform/platform-impl/src/com/intellij/openapi/editor/impl/EditorGutterComponentImpl.java

@@ -487,7 +487,7 @@ class EditorGutterComponentImpl extends EditorGutterComponentEx implements Mouse
       EditorFontType style = gutterProvider.getStyle(line, myEditor);
       Font font = getFontForText(s, style);
       g.setFont(font);
-      g.drawString(s, getGapBetweenAnnotations() / 2 + x, y + myEditor.getAscent());
+      g.drawString(s, (gutterProvider.useMargin() ? getGapBetweenAnnotations() / 2 : 0) + x, y + myEditor.getAscent());
     }
   }
 
@@ -772,7 +772,7 @@ class EditorGutterComponentImpl extends EditorGutterComponentEx implements Mouse
           gutterSize = Math.max(gutterSize, fontMetrics.stringWidth(lineText));
         }
       }
-      if (gutterSize > 0 && j < guttersCount - 1) gutterSize += getGapBetweenAnnotations();
+      if (gutterSize > 0 && gutterProvider.useMargin()) gutterSize += getGapBetweenAnnotations();
       myTextAnnotationGutterSizes.set(j, gutterSize);
       myTextAnnotationGuttersSize += gutterSize;
     }