Revert "lst: do not use hardcoded constant"

EA-80375 - NPE: LineStatusTrackerDrawing$PopupPanel.getEditorTextOffset
There are no editor for added lines, but we want popup to always have the same offset.

This reverts commit 87624908fd.

platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTrackerDrawing.java

@@ -480,7 +480,7 @@ public class LineStatusTrackerDrawing {
   }
 
   private static class PopupPanel extends JPanel {
-    private final JComponent myEditorComponent;
+    @Nullable private final JComponent myEditorComponent;
 
     public PopupPanel(@NotNull final Editor editor,
                       @NotNull ActionToolbar toolbar,
@@ -548,7 +548,7 @@ public class LineStatusTrackerDrawing {
     }
 
     public int getEditorTextOffset() {
-      return myEditorComponent.getInsets().left;
+      return 3; // myEditorComponent.getInsets().left
     }
   }
 }