ABI summary:

• mirclient ABI unchanged at 10
• miral ABI unchanged at 4
• mirserver ABI unchanged at 54
• mircommon ABI unchanged at 7
• mirplatform ABI bumped to 21
• mirprotobuf ABI unchanged at 3
• mirplatformgraphics ABI bumped to 19
• mirinputplatform ABI unchanged at 7
• mircore ABI unchanged at 1
• mircookie ABI unchanged at 2

Enhancements:

• Add logical output group (aka "display wall") support
• [X11] Pick up min/max size
• [wayland] Allow adding and dropping Wayland extensions
• [performance-tests] Use a EGL visual with no alpha channel
• [wayland] More correct handling of DRM_FORMAT_MOD_INVALID
• [debian] Add metapackages for each of the graphics platforms
• [miral-app] more robust launcher script
• [gbm-kms] Implement composite-bypass for Wayland clients

Bugs fixed:

• [mir-kiosk] Fix --startup-apps option
• [wayland] linux-dmabuf: Fix sending invalid modifiers
• [wayland-platform] Report host refresh rate correctly. (Fixes: 1741)
• [wayland-platform] Flush Wayland messages on the correct thread. (Fixes: #1775)
• [X11] Support undecorated windows. (Fixes: #1758)
• Fix Rawhide FTBFS. (Fixes: #1743, #1746)
• Support software buffers on X11, Wayland and GBM/KMS. (Fixes: #914)