Mir 2.29.0

• New upstream release 2.29.0

  • ABI summary:

    • miral ABI bumped to 8
    • mircommon ABI bumped to 13
    • mircore ABI bumped to 3
    • miroil ABI bumped to 10
    • mirplatform ABI bumped to 35
    • mirserver ABI bumped to 68
    • mirwayland ABI bumped to 7
    • mirplatformgraphics ABI bumped to 24
    • mirinputplatform ABI bumped to 11

  • Enhancements:

    • [Wayland] Implement xdg-dialog-v1 Wayland protocol #4790, #5122
    • [Wayland] Add support for the ext_foreign_toplevel_image_capture_source_manager_v1 extension #5002
    • [Wayland] Add support for taking a screenshot of a single surface #4936
    • [Wayland] Implement wl_region::subtract and tidy wl_region::add #5003
    • Add a touch emulator to map mouse clicks and drags to touch events #5091
    • Add command-line logging configuration #4928
    • [miral] Add register_log_filtering_config convenience helper #4937
    • [live config] Support for override directory #4781
    • [graphics] Add bytes-per-pixel to DRMFormat and use it for SHM stride validation #5000
    • [evdev-rs] Remove the blocking future await when grabbing a device file descriptor #4960

  • Renovations:

    • Migrate to C++26 #5028
    • Rebase on newest distro releases #4738
    • [miral] Use std::span in interfaces where possible #5078
    • [miral] Ref qualify WindowSpecification properties #5081
    • [miral] Tidy up the WindowManagementPolicy hierarchy #5072
    • Remove prompt sessions #5045
    • Remove EGLStream support #5044
    • Remove wl-drm support in favour of DMA-BUF #5061
    • Remove deprecated APIs #5018, #5021, #5057
    • Drop obsolete WindowManager::{add,remove}_display() methods #5023
    • Drop ServerConfiguration::the_screen_shooter() #5085
    • Drop AutoJoinThread #5066 and assorted dead code #5058, #5076, #5084
    • Update DecorationProvider to xdg-shell #4939

  • Bugs fixed:

    • wayland platform: two fixes for running Mir nested under another compositor #5020 (thanks @Azkali!)
    • miral: fix constrain resizes of windows without a size #4979 (thanks @muhammad23012009!)
    • Validate all inputs to wl_shm_pool::create_buffer #4885
    • frontend_wayland: raise invalid_fd when an SHM pool fd cannot be mapped #5010
    • frontend_wayland: reject xdg_toplevel max size smaller than min size #5008
    • Raise invalid_offset for non-zero wl_surface.attach offset (v5+) #5004
    • Raise invalid_size from xdg_surface.set_window_geometry #5006
    • Validate the serial in xdg_surface.ack_configure #5007
    • Track what type of data offer is being provided and validate requests #4935
    • Ensure no loops in toplevel parents #4894
    • [miral] ApplicationSwitcher: use whatever identity we have rather than treating a window as a "ghost" #5083. Fix late toplevel identity #5131
    • Return early from {add,drop}_input_trigger_event to avoid logging incorrectly #5082
    • ShmBacking: fix ignored std::expected return values #5024 and switch current_mapping to std::atomic #5026
    • [miral] add missing PhysicalSizeMM::operator== #5037 and constructor #5035 symbols
    • Fix FTBFS on amd64v3 #5060, #5127
    • refactor(x11): isolate the xcb XKB include workaround #5121

  • Documentation:

    • doc: update to Sphinx Stack 2 #5050
    • docs: update documentation for configuring screencasting via ext-image-copy-capture #5036
    • Document the Mir config override mechanism #5077
    • How to test Mir for a release #4992
    • Fix documentation errors in input trigger protocols #5070
    • doc: fix "Release notes" title and links #5062
    • doc: use -dev version outside of release branches #5056
    • Spelling fixes and skill #5011
    • Expand copilot instructions with build, CI, ABI and protocol integration guides #4913, and commenting/review guidance #5094