Resolves#10477.
The dark theme box-shadow for buttons does not blend well
when hovering over it, compared to the light & gray themes.
This patch adds an additional CSS rule to make the box-shadow
no longer clash in dark theme.
This continues the theme definition work from bd398d5c.
A new edge-border-color tag was created
to allow for defined widget edges in both
light and dark themes.
The box-shadow highlights for buttons
and header/menubars was defined to
reduce system theme leaks. Some CSS
attributes were rearranges as well.
This adds a border when hovering over icons in various
grid views (brushes, gradients, etc). This makes it more
visually apparent which option you can click to select.
The Default theme may have been a bit too dark. Instead let's have it a
tiny bit lighter (and also foreground color a bit less white).
For now, the old "Default" dark theme doesn't disappear totally and is
moved to a "Darker" theme as we have been discussing and wondering on
whether this is prefered by some people (it is). Aryeom also thought a
darker theme may be a good idea.
Moreover Liam actually thought that losing some of the contrast
(especially with the text a tiny bit less white now) is not desired in
his case where eyes may not be as sharp as they used to. Therefore a
"High Contrast" theme may be needed.
Aryeom also suggested that sliders to choose colors could be a much more
generic solution, which might be possible yet would require more ugly
hacks generating on-the-fly theme changes (we do something similar for
dark theme choice already).
This is all work-in-progress and a result from Wilber Week 2023 work.
Alx Sa