#25 1.3.3 reproduceable lockup on undo

[James Paige]

Run gnp and start with an Untitled file.

Type a few lines of text.

Select the lines you just typed

Paste the lines over and over again until you have a
moderately long document. This bug is not reproduceable
on short documents.

Now select a portion of the last line, and press delete

Now press CTRL+Z to undo the deletion

Instead of bringing back the text you just typed, the
program will lock up.