Overview of Changes in 4.15.6, 08-26-2024
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* GtkCheckButton:
 - Add a grouped style class for radio buttons

* GtkScale:
 - Fix alignment and positioning problems

* Css:
 - Fix crashes in the variable support

* Gsk:
 - Make graphics offloading work better with kwin
 - Make colorstate transfer functions more robust
 - GC dead textures more agressively
 - Only use a single render pass per frame

* GL:
 - Round damage rectangles properly
 - Use the shared context when creating textures
 - Fix a file descriptor leak in dmabuf export

* Vulkan:
 - Round damage rectangles properly

* Wayland:
 - Work with the kwin implementation of xx-color-management-v4

* Windows:
 - Make gtk_show_uri use SHOpenWithDialog()
 - Enable incremental rendering with WGL

* Macos:
 - Open context menus on Ctrl-left click

* Debugging:
 - Show color state information in the inspector
 - Collect input event traces in the recorder
 - Add shortcuts for toggling recording: Super-r
   and for screenshots: Super-c
 - Split the GDK_DEBUG env var into GDK_DEBUG and GDK_DISABLE
 - Add GDK_DISABLE=color-mgmt and GDK_DISABLE=offload

* Tools:
 - Add a 'Paste as node' action in gtk4-node-editor

* Translations updates
 Basque
 Belarusian
 Brazilian Portuguese
 Chinese (China)
 Georgian
 Hebrew
 Hindi
 Russian
 Slovenian
 Turkish
 Ukrainian