Re: [PATCH] git-gui: Fix selected text colors

[serg.partizan@gmail.com]

On Sun, Nov 22, 2020 at 16:41, Stefan Haller <stefan@haller-berlin.de> 
wrote:
> Preserving the previous behavior is probably a good idea when fixing a
> regression.
> 
> However, it would actually be nice to have different colors for active
> and inactive selection (could be a follow-up patch). In native Mac and
> Windows applications the active selection background is usually light
> blue, and the inactive one is light grey. This would not just be a
> cosmetic improvement that looks prettier (that wouldn't be worth it),
> but it would be a real usability improvement because it would make it
> much easier to tell which of the four main views has the keyboard 
> focus.
> 
> I couldn't find a way to query the inactive selection colors, though. 
> Do
> you know if there's a way to do that? If not, I guess one way to do 
> this
> is to numerically calculate a grey color with a similar brightness 
> from
> the active selection background. I could work on a patch if you think
> this is an approach that makes sense.

I'm using this code in `wish` to query widget for available options:

 > text .t
 > .t configure

And it shows this widget has `-inactiveselectbackground` option. 
However, it doesn't have `-inactiveselectforeground` as I was thinking 
in previous patch.

 > .t configure -inactiveselectbackground
-inactiveselectbackground inactiveSelectBackground Foreground #c3c3c3 
#c3c3c3

But I have no idea how to get this colors from ttk::style. Looking at 
awdark theme, it set's inactiveselectbackground in function 
setTextColors, which is used on text widget directly. And we cannot use 
it here.

I think calculating that gray color from current selection bg is too 
much work for just one color.

We can just set inactiveSelectBackground to some neutral gray color 
like #707070 or #909090 which will work fine with both dark and light 
themes.

And, because we're using "widgetDefault" priority - themes can override 
this, when they want to explicitly set this color.