Fix the huge default margins in GTK+3 statusbar #248
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This is hardcoded in the UI file:
https://github.com/GNOME/gtk/blob/gtk-3-22/gtk/ui/gtkstatusbar.ui#L6
So the default margins have to be subtracted from the desired margin.
This is inspired by how the Canta theme fixes it:
https://github.com/vinceliuice/Canta-theme/blob/db96a1e27e131e4a0fad1e7e2b656179db46b5e8/src/_sass/gtk/apps/_mate.scss#L286
The large size results in various bug reports and issues like:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=456345
zim-desktop-wiki/zim-desktop-wiki#342
geany/geany#1825
https://unix.stackexchange.com/questions/271042/gtk3-statusbar-height
And C-based fixes like:
https://git.xfce.org/apps/ristretto/commit/?id=289329
https://github.com/xfce-mirror/thunar/blob/fe53f759991f3e5df89a4496dc9b353d0560b762/thunar/thunar-statusbar.c#L111
I've read that this has been fixed in Cinnamon and Unity themes, presumably in a similar fashion, but I don't have any of those to test.
It seems like a bad fix for every individual application to be forcing the margins to zero in C code, which is why I made this PR here. At least it would fix all XFCE apps with the default theme.
NOTE: This isn't tested, I don't know much about SASS, and I'm not sure that
2px
is the best value, I just wanted to see if something could be done about the large status bar.