Overview of Changes in 4.15.1, 21-05-2024
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* GtkGraphicsOffload:
 - Don't crash without a child

* GtkSpinner:
 - Don't animate when unmapped

* CSS:
 - Support the :root selector
 - Support variables and custom properties (https://www.w3.org/TR/css-variables-1/)
 - Implement math functions (https://www.w3.org/TR/css-values-4/)
 - Support modern syntax and calc in rgb() and hsl()

* Icontheme:
 - Make symbolic svg loading more efficient
 - Handle color-free symbolics more efficiently

* Accessibility:
 - Make the gtk-demo sidebar search more accessible
 - Stop emitting focus events
 - Realize child contexts when necessary

* GDK:
 - Support XDG_ACTIVATION_TOKEN
 - dmabuf: Be more defensive when importing unknown formats to GL
 - dmabuf: Use narrow range for YUV
 - vulkan: Recreate swapchains when necessary or beneficial

* GSK:
 - Improve logging for GDK_DEBUG=offload
 - Improve logging for GSK_DEBUG=renderer
 - gpu: Warn about inefficient texture import
 - gpu: Handle tiny offscreens correctly
 - vulkan: Add profiler marks in various places
 - vulkan: Fix a problem with imported dmabufs showing up black
 - cairo: Speed up mask nodes, since we use them for symbolic icons

* Wayland:
 - Use wl_compositor version 6

* X11:
 - Implement a missing method

* Build:
 - Fix many ubsan warnings

* Debugging:
 - Show more texture details in the recorder
 - Use GTK_DEBUG=css to see CSS deprecations

* macOS:
 - Fix problems with events handed back to the OS
 - Respect GDK_DEBUG=default-settings
 - Allow applictions to handle Dock > Quit

* Deprecations:
 - Use of @name colors in CSS

* Translation updates:
 Catalan
 Georgian
 Hungarian
 Korean
 Portuguese
 Turkish