Overview of Changes in 4.15.2, 28-06-2024
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* GtkFileChooserWidget:
 - Plug some memory leaks
 - Make Ctrl-Shift-N create a new folder

* GtkPopover:
 - Handle resizing and position changes better

* CSS:
 - Support color(), oklab(), etc (https://www.w3.org/TR/css-color-4/)
 - Support color-mix() (https://www.w3.org/TR/css-color-5/)
 - Support relative colors (https://www.w3.org/TR/css-color-5/)
 - Support more colorspaces in color()
 - Allow percentages for opacity
 - Handle currentcolor more correctly

* Accessibility:
 - Avoid markup when reading labels

* GSK:
 - Subset fonts when serializing node trees
 - Make ngl export render_texture results as dmabufs

* Wayland:
 - Use xdg-dialog protocol for attached dialogs

* Windows:
 - Build with UNICODE

* macOS:
 - Implement fullscreen-on-monitor

* Documentation:
 - Widget shortcuts and actions are now described in the docs

* Debugging:
 - Add GTK_DEBUG=css for warning about deprecated css syntax

* Tools:
 - rendernode-tool: Add an extract command for data urls

* Deprecations:
 - CSS Color functions shade(), lighter(), darker(), alpha(), mix()

* Translation updates:
 Czech
 Hebrew
 Serbian