This is the second time I have noticed this, so I have determined it is not a bug. Twice now I have made about 30 lines of edits to a file, and then used Undo to reverse them all. Both times I have gotten all kinds of left over code.

For example, my original code was something like:



Then I changed it to:



When I undid all of my changes I was left with:



Again, these aren't the exact snippets I worked with, but approximations.

Another yet related issue was that lines that were indented before an undo ended up with no indentation on a redo. Dmitri had this to say:


Please check "keep trailing blanks" in the editor settings.
When this option is not checked, editor deletes spaces and tabs in non-undoable manner and that's why they are not restored. Make hidden character shown (View->Show Hiddent Characters) and try to replicate the problem again and you'll see that tabs are deleted when you leave the line.

That fixed the indentation problem, but not the issues in the previous posts above.

-r

I am still having issues with this in b5028.

We are aware of this problem but it can't be fixed in version 5.0 without huge changes in the editor. We planned them for the next major release.
Meanwhile, as a workaround please do not turn on OPTIMAL FILL and do not turn off KEEP TRAILING BLANKS.