Tab labels are truncated (Windows 7+)

[Patrick Storz]

On Windows tab labels (specifically labels in tabs of a GtkNotebook) are truncated on the right (see screenshot).
It seems the alignment is messed up, i.e. labels are shifted to the right, as apparent from the selection outline also visible in the screenshot.

Does anybody know how to fix this possibly by adjusting gtkrc accordingly? I can't figure out how to select those labels and/or what style attributes to change in order to make it work.

[jazzynico (jazzynico)]

Not reproduced on Windows XP (32-bit), Inkscape 0.91 and trunk rev. 14663 (tested with English, French and German UI).

Could you please try the win32 version and confirm it affects the 64-bit version only?

[Patrick Storz (ede123)]

This is independent of the Inkscape version used (0.91/trunk x86/x64) they're all affected.

Is the label really centered on XP or is the border just larger so that it doesn't get truncated?
Anyway it seems to be OS dependent then and also happens on Windows 10 (see screenshot)

[Alvin Penner (apenner)]

confirmed on Windows 7 (32 bit), Inkscape 0.91 r13725 (Jan 30 2015)

when looking at the Document Properties dialog, Page tab, the text in the word "Page" appears to be right-aligned.
A similar behavior is seen when exporting a file as dxf. In the export dialog there is a tab called Options. The word "Options" appears to be right-aligned. screenshot attached here

[Patrick Storz (ede123)]

It's happening everywhere where a GtkNotebook widget is used (e.g. all extensions using notebooks).

[jazzynico (jazzynico)]

Also confirmed on Windows 7 (32-bit), Inkscape 0.91 and an old 0.47.

[Patrick Storz (ede123)]

To complete the list of screenshots...
Tab labels aren't centered on Windows XP either, they're not getting truncated though (as jazzynico already mentioned)

[jazzynico (jazzynico)]

Just tested some changes with the theme (thanks to https://wiki.gnome.org/Attic/GnomeArt/Tutorials/GtkThemes/GtkNotebook) but none of the available properties seems to have any effect. Investigations in progress.

[Patrick Storz (ede123)]

I wasn't able to find a solution either (but I'm also not experienced with GTK+ at all).

The property "tab-curvature" allows to hide the issue by increasing whitespace around tabs so the label isn't truncated anymore, but it obviously doesn't fix the alignment and therefore the cause of the problem.

[jazzynico (jazzynico)]

Forgot that one...
Adding "GtkNotebook::tab-curvature = 2" (or more) to the gtkrc file seems to fix the truncation. But it's still not correctly centered.

[Patrick Storz (ede123)]

Just a bit of additional information:
The program "gtk-demo" (test program that is part of GTK) is also affected by this issue, so it's not exclusive to Inkscape.

Leaves the question if it is a general issue with GTK that needs to be fixed in GTK code or if it is something we can work around using gtkrc or similar methods.

I'll investigate further and report and upstream bug when I find the time.

[jazzynico (jazzynico)]

I suggest that we workaround the bug in the .gtkrc file for now, with a comment explaining why the property change is needed (and a link to the report).