Overview of Changes in 4.21.2, 20-11-2025

GSK

• GskRenderNodeReplay is a new API that can assist with manipulating render node trees in various ways
  
• The new copy and paste node types allow referring to the 'background' during rendering, which enables new features such as backdrop-filter
  
• The new composite node type allows to combine rendering with the'background' in more interesting ways than just rendering it on top
  
• Radial gradients can be defined with non-concentric circles
  

GtkSvg

• <line>, <polyline> and <polygon> are now supported
  
• Gradients are fully supported, including non-concentric radial gradients and reflecting as a spread method
  

CSS

• A reduced-motion setting has been added, and is exposed to CSS via media queries
  
• the backdrop-filter property is supported
  

GtkEmojiChooser

• The Emoji chooser has been updated for CLDR 48
  

GtkFontDialog

• The language filtering has been improved
  

Bugs fixed

• GNOME/libadwaita#892 Adw.PreferencesDialog focus move (Alice Mikhaylenko)
  
• #4062 gtk_media_file_set_input_stream assertion failure when using GStreamer
  backend
  
• #7820 Follow-up on loose ends in the state saving support
  
• #7857 Feature: Add Win32 impl for gtk_file_launcher_open_containing_folder()
  (Sergey Bugaev)
  
• #7862 icon-editor: SVG not viewable in firefox (Matthias Clasen)
  
• #7866 Vulkan: Validation: vkQueuePresentKHR(): PRESENT_AFTER_WRITE hazard
  detected. (Benjamin Otte)
  
• #7867 ModelButton: Increasingly long hang when switching AdwMultiLayoutView
  (Emmanuele Bassi)
  
• #7872 modelbutton: Accels not accessible in non-English (Adrien Plazas)
  
• #7877 Have a toggle for reduce motion in inspector (Emmanuele Bassi)
  
• #7878 CSS tab in inspector doesn't follow reduce-motion (Emmanuele Bassi)
  

Changes

• !7186 media: Add a bin to handle input streams (Matthias Clasen)
  
• !8826 fontchooser: Add a search bar to filter the language list (Sudip Shil)
  
• !9055 API: Add GskRenderNodeReplay (Benjamin Otte)
  
• !9096 image tool: Some refinement (Matthias Clasen)
  
• !9097 svg: Support the remaining shapes (Matthias Clasen)
  
• !9099 Tie up state saving loose ends (Adrian Vovk)
  
• !9103 icon editor: Plug a memory leak (Matthias Clasen)
  
• !9105 svg: Make fx,fy default to cx,cy (Matthias Clasen)
  
• !9106 svg: Take dependencies into account (Matthias Clasen)
  
• !9107 inspector: css-editor: Replace disable button with a switch (Jules
  Maselbas)
  
• !9108 svg: fix printf format for size_t variables (g.willems)
  
• !9109 gtkfilechoosercell: Actually add long pressure gesture (Marco Trevisan
  (Treviño))
  
• !9110 pathbar: Plug a memory leak (Matthias Clasen)
  
• !9111 Fix touch dropdown selection (!8041) properly (Florian "sp1rit"​)
  
• !9112 Cosmetics: Add section markers (Matthias Clasen)
  
• !9114 svg: Allow keyPoints to be outside of 0, 1
  
• !9115 Rework radial gradients (Matthias Clasen)
  
• !9116 svg: fix Windows builds (g.willems)
  
• !9117 win32: Add a facility to open containing folder (Sergey Bugaev)
  
• !9118 css: Fix some properties' inheritance (Adrien Plazas)
  
• !9121 gsk: Don't leak ccs_texture_caches (Doug Nazar)
  
• !9122 colorstate: Add a static assert (Benjamin Otte)
  
• !9124 Merge the theme assets and rework the generation script (Berk Elyesa
  Yıldırım)
  
• !9125 Split rendernodes into their own files (Benjamin Otte)
  
• !9126 Add copy and paste rendernodes (Benjamin Otte)
  
• !9127 ci: use system meson for android
  
• !9128 vulkan: Rework swapchain present implementation (Benjamin Otte)
  
• !9129 doc: Fix GTK_ACCESSIBLE_PROPERTY_HAS_POPUP (Adrien Plazas)
  
• !9130 gsk: Add gdk_color_is_srgb() (Benjamin Otte)
  
• !9131 svg: Collect test output (Matthias Clasen)
  
• !9132 svg: Fix animate transitions with delay (Matthias Clasen)
  
• !9134 Reset ModelButton accessible relations (Emmanuele Bassi)
  
• !9135 Support repeating conic gradients (Matthias Clasen)
  
• !9136 widget: Sanity-check ancestor type (Sergey Bugaev)
  
• !9137 a11y: When setting an accessible relation, clear out previous reverse
  ones (Lukáš Tyrychtr)
  
• !9139 gsk: Typo fix (Matthias Clasen)
  
• !9140 Fix repeating conic gradients (Matthias Clasen)
  
• !9143 icon editor: Get rid of AnimationType (Matthias Clasen)
  
• !9144 Revert "gsk: Fix the conic gradient implementation" (Benjamin Otte)
  
• !9145 gtk: Document GTK_DEBUG_SESSION (Maximiliano Sandoval)
  
• !9146 modelbutton: Use accessible keyshortcuts labels (Adrien Plazas)
  
• !9149 svg: Turn simple NULL returns on errors into return_if_fail()
  (Benjamin Otte)
  
• !9151 icon editor: Allow more shapes (Matthias Clasen)
  
• !9152 emoji: Update data to CLDR 48 (Jeremy Bícha)
  
• !9153 Some more rendernode splitoffs (Matthias Clasen)
  
• !9156 gsk: Change the linear gradient shader api (Matthias Clasen)
  
• !9157 Some icon editor fixes (Matthias Clasen)
  
• !9158 icon-editor: fix msys2 linker failure (g.willems)
  
• !9159 API: Add GskCompositeNode (Benjamin Otte)
  
• !9160 testsuite: Add an "opaque" run to compare-render (Benjamin Otte)
  
• !9161 node editor: Unset GtkApplication:save-state (Matthias Clasen)
  
• !9162 cssprovider: Actually reload when prefers-reduced-motion changes
  (Alice Mikhaylenko)
  

Translation updates

• Serbian (Милош Поповић)
  
• Slovenian (Martin)