The code which removes trailing whitespace is somehow getting confused by the file getting reloaded from disk while open
in the editor, and considers all lines to have been "edited".

I know this will sound obscure to be a P2, but in fact it is causing significant problems for those of us preparing
patches using MQ - the patches are getting filled with unnecessary and distracting whitespace changes to dozens of lines
(since most existing NB source has trailing spaces), making them harder to review, as well as being far more likely to
fail to apply cleanly later.


Reproduction is a bit complicated but you should be able to do it:

1. Run 080701 on fresh user dir.

2. Make a new Java Application project somewhere.

3. In Main.java, on the blank line before the final brace, enter "    " and save. Move caret to top of file. This
ensures that the trailing whitespace is committed to disk.

4. Install the Strip Whitespace plugin from AU. You should see the trailing whitespace in gray.

5. Versioning > Mercurial > Initialize Project

6. Commit on root node of project (so should now have clean status).

7. (from shell with CWD set to project basedir) hg qinit; hg qnew x.diff

8. Add to top of file (beneath package statement) in IDE's editor:

import java.util.Date;

Should be marked as an unused import. Save. Will still have original "    " after main method.

9. hg qref; hg qpop

10. View editor; import gone.

11. hg qpush

12. View editor; import back. "    " still there.

13. C-S-I to fix imports. Import gone; "    " still there.

14. Save. "    " disappears, even though no edits were made to this line.


Seems that it is also possible to reproduce without using Mercurial:

1-4 as above.

8 as above.

Make some unrelated change in the file using another text editor outside NB: e.g. add a blank line to start of file. Go
back to IDE, which will reload showing the external change.

13 and 14 as above.