Add support for high contrast theme

[d-loose]

Adds high contrast borders to

• YaruTitleBar
• YaruWindowControl
• YaruMasterTile

[Jupi007]

Great, thanks @d-loose

LGTM 👍

[jpnurmi]

Thanks, @d-loose! Any concerns with this approach @Feichtmeier and @Jupi007? Unlike my earlier attempt with "barely noticeable" borders, this keeps the normal themes untouched.

[Feichtmeier]

Since it doesn't affect the normal themes it's ok

[Jupi007]

I just have one note: is adding a border change the size of the window controls?

[Feichtmeier]

I just have one note: is adding a border change the size of the window controls?

that would be bad 🤔

[d-loose]

I just have one note: is adding a border change the size of the window controls?

Hm, unfortunately it does:
(upper is gnome-settings, lower is yaru_widgets example)

Normal	High Contrast

I'll look into a cleaner solution tomorrow!

[jpnurmi]

@Jupi007 good catch!

[Jupi007]

Well, this need to be fixed as it can create unexpected situations :)

I see two solution:

• reduce the control size in HC mode ;
• or use a border of the same colour as the background in non-HC mode (be careful to the colour transition).

Edit: I suppose there is the same problem with YaruMasterTile.

[Feichtmeier]

There is one more option: just make the windoh window controls black/white and the icons on them white/black 🤷

[d-loose]

Learned about strokeAlign :)

	Dark	Light
Normal
High Contrast

[Jupi007]

Great, thanks @d-loose

I didn't know this strokeAlign property

[Feichtmeier]

Bildschirmaufzeichnung.vom.24.03.2023.11.00.04.webm

can't see any visual regression