8716 Add Rect.fromCenter() constructor (cla: yes)

8721 Fix header include guards for fml/thread_local.h (cla: yes)

8723 Fix include paths in libtxt to prepare for upcoming Skia build change (cla: yes)

8735 Fix reflective ctor invocation in FlutterFragment (cla: yes)

8738 Revert “Increase the memory usage estimate for EngineLayer” (cla: yes)

8742 Log the sticky error during isolate shutdown (cla: yes)

8747 Fix crash when cursor ends up at invalid position (cla: yes)

8758 Check the matrix in pushTransform (cla: yes)

8772 colormatrix is now 0…1 (cla: yes)