42ae052da7
This keyboard works similar to GTK+'s emoji chooser (actually, both pull from the same JSON file). Emojis are categorized in sections and variants and kept in a "model". The EmojiPager actor then uses this model to generate pages on-the-fly as the user swipes around. This is an important optimization since the amount of actors would rival with the rest of the shell otherwise. The EmojiSelection object puts the EmojiPager, the page indicators and a KeyContainer with the bottom row of emoji section shortcuts together to implement the emoji panel as a whole. The Keyboard object hooked this to an "emoji" key, which is just visible on the Clutter.InputContentPurpose where showing an emoji would be meaningful. Otherwise the surrounding buttons are made a bit wider to cover up for it (i.e. as it was before).
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.