Steps to reproduce:
1) open attachment 117083 [details] in Writer
2) window #1 has the cursor at the beginning of the first paragraph
3) window -> new window
4) put the cursor of window #2 to the end of the first paragraph (second line)
5) type 'bbb' in window #2
6) press undo in window #2
7) only window #2 is repainted, window #1 is left unchanged, 'bbb' is still there
Miklos Vajna committed a patch related to this issue.
It has been pushed to "master":
tdf#101168 sw: fix missing repaint on undo with multiple windows
It will be available in 5.3.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.