Created attachment 114980 [details]
document I used to discover the reported bug
Enabling "table → table properties → Text Flow → keep with next paragraph" DOES enable the setting. However, going back into the table properties shows it as "unchecked". This prevents you from disabling the setting since your only option is to turn on a setting that is already effectively on.
Bibisecting and further compiling showed this regression to be caused by Zolnai Tamás <firstname.lastname@example.org> 2015-03-16 23:10:01 (GMT)
SfxTabDialog: avoid changing const input parameter
I tested with Linux only, so marking that way, but assuming this affects all. Marking as major since the code change was affecting tabs in general, not "keep with next paragraph" specifically so likely there are many more side effects.
Zolnai Tamás committed a patch related to this issue.
It has been pushed to "master":
tdf#90766: Table - keep with paragraph setting is broken
It will be available in 5.0.0.
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.