The problem occurs when you add/delete lines in the non-guarded area. If you add/remove breakpoints using the editor`s context menu, they appear at the current position +/- offset, where `offset` is
 equal to the number of previously added/deleted lines.

Other methods of adding/removing breakpoints do not seem to suffer from this problem.

After saving the modified file, it fixes -- the context menu action works fine.

Steps to reproduce:

1. In the editor, add or delete a few lines to a java source file.
2. Move the cursor below the point where changes has been made.

3. Right-click in the editor pane and select Add/Remove Breakpoint in the context menu.
4. You should see a misplaced breakpoint.