3eb40df06b
With the introduction of the transparent panel in the overview, we started making the panel text/icon color slightly brighter in the overview and on the lockscreen to ensure best contrast. Now unfortunately, setting the text color incurred a relayout of the underlying ClutterText actor (fixed with https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1750), and setting the icon color causes the icon texture to get regenerated (fixed with https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/932). Regenerating the icon texture will replace the icon actor, which also causes a relayout. This relayout of the panel has been measured to add at least 1 millisecond (the numbers fluctuated a lot) to about 5 ms it takes to layout the first frame when showing the overview. Since https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/932 is unlikely to land this cycle, this commit proposes a different solution: Simply don't use a different color for text in the overview. To avoid issues with contrast in the overview, make the default color slightly brighter and change it from #ccc to #ddd. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1733>
Summary
Do not edit the CSS directly, edit the source SCSS files and the CSS files will be generated automatically when building with meson + ninja and left inside the build directory to be incorporated into the gresource XML (you'll need to have sassc installed).
How to tweak the theme
Adwaita is a complex theme, so to keep it maintainable it's written and processed in SASS, the generated CSS is then transformed into a gresource file during gtk build and used at runtime in a non-legible or editable form.
It is very likely your change will happen in the _common.scss file. That's where all the widget selectors are defined. Here's a rundown of the "supporting" stylesheets, that are unlikely to be the right place for a drive by stylesheet fix:
| File | Description |
|---|---|
| _colors.scss | global color definitions. We keep the number of defined colors to a necessary minimum, most colors are derived from a handful of basics. It is an exact copy of the gtk+ counterpart. Light theme is used for the classic theme and dark is for GNOME3 shell default. |
| _drawing.scss | drawing helper mixings/functions to allow easier definition of widget drawing under specific context. This is why Adwaita isn't 15000 LOC. |
| _common.scss | actual definitions of style for each widget. This is where you are likely to add/remove your changes. |
You can read about SASS on its web page. Once you make your changes to the _common.scss file, you can run ninja to generate the final CSS files.