This only happens in Impress (I've tried similar steps in Calc and Draw and there it works as expected).
How to reproduce:
1. New Impress document
2. Type something into the slide title field
3. Select portion of the text with mouse
4. Click Font Colour split button (right half of it) in sidebar so that a font colour pop-up dialog appears
5. Click palette selection combo box and try to change the colour palette to something else than default ...
6. ... and realize you can't because by now the whole dialog has disappeared
This might be desktop-environment and OS-specific -- I'm on Fedora 21 and use KDE
I was able to change the palette.
Win 7 Pro 64-bit Version: 22.214.171.124.alpha0+ (x64)
Build ID: 53d7c88da82f6d16c0c9a45a86a3f9d505764605
TinderBox: Win-x86_64@42, Branch:master, Time: 2015-04-10_02:14:19
Ubuntu 14.10 64-bit
Build ID: afb82d3729bda2754d0add08cc6c4dce1dc76d59
TinderBox: Linux-rpm_deb-x86_64@46-TDF-dbg, Branch:master, Time: 2015-04-14_00:05:04
The oddness ... so the trick seems to be, do steps 3, 4 and 5 repeatedly.
I've tried again and for 1st time, I was able to change the palette, too. 2nd and every consecutive time (i.e. when I selected another portion of the text, clicked font colour button and wanted to changed the palette) not anymore. The dialog closed on click.
(In reply to Katarina Behrens (CIB) from comment #2)
> The oddness ... so the trick seems to be, do steps 3, 4 and 5 repeatedly.
> I've tried again and for 1st time, I was able to change the palette, too.
> 2nd and every consecutive time (i.e. when I selected another portion of the
> text, clicked font colour button and wanted to changed the palette) not
> anymore. The dialog closed on click.
Just tested again, changed the palette and colored text 4 times without problems.
Win 7 Pro 64-bit Version: 126.96.36.199.alpha0+ (x64)
Build ID: 211c12b9c64facd1c12f637a5229bd6a6feb032a
TinderBox: Win-x86_64@42, Branch:master, Time: 2015-04-18_01:51:17
Aw, so this seem to be KDE-specific. Adjusting summary accordingly
Tried the same w/ GNOME and there it works. The major difference is that in GNOME, the pop-up dialog opens over the sidebar, approx. where the font colour button is. In KDE, the pop-up dialog is floating somewhere in the middle of the screen.
ubuntu 15.04 + KDE
Confirmed - no need to repeat, happens every time on first try.
Note: Also happens for top toolbar - not sidebar specific for me at least.
Seems like there are quite a few issues with toolbars and dialogs in KDE, I just reported another: bug 90759, and I know of at least one other. Wonder if this is a larger issue that requires further investigation.
Major - cannot use color palettes at all in KDE, think it deserves major.
High - default seems appropriate.
also not limited to impress - setting component to LibreOffice.
Works again after http://cgit.freedesktop.org/libreoffice/core/commit/?id=c4bae028efbd32c8938c3a6051d58c1f202d5b8a
*** This bug has been marked as a duplicate of bug 90155 ***