Make the color of the window-appicon in custom window titlebar customizable

[yuval-gilboa]

This is a feature request for customizing the window-appicon in the custom workbench titlebar. The SVG image for the appicon should be defined using fill: currentColor so it inherits the foreground color of the titlebar, or better yet, add a special color entry for it in the workbench color customizations section.

This would allow adjusting the appicon appearance to custom titlebar backgrounds and avoid contrast issues like below:

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Custom titlebar appears late compared to native titlebar (#52507)

[miguelsolorio]

We could look at providing the option to use either the default icon or the foreground color (which is what the title bar text uses). This can get a little tricky as we currently use the icon to show what version of VS Code is being used (blue = stable, green = insiders).

@sbatten, thoughts?

[sbatten]

@misolori I'm not opposed to making the icon themable to the extent of using the foreground color. Just want to make sure that's something that fits in our guidelines.

[miguelsolorio]

This goes against our branding guidelines since we only ever use Blue (Stable), Green (Insiders), Orange (Explorations), Black/White when needed. So will be closing this as out of scope.

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