sidebar: use real height to determine preffered size

There was a bug causing to crop the sidebar in online:
1. open odt file in 2 sessions
2. select image in session A
3. move mouse over sidebar in session B
4. move mouse over sidebar in session A
Result: sidebar A was cropped

PosSizePropertyPanel on context change
did some windows visibility changes in the meantime.
get_preffered_size() returned lower height than real
value in SidebarPanelBase::getHeightForWidth

call queue_resize to invalidate cached optimal size

Change-Id: I8080259ffb12ae3f6613e7749e908d6ef55c1f3a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/110894
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/112092
Tested-by: Jenkins
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>

0 files changed, 0 insertions, 0 deletions