Carlos Garnacho authored May 24, 2023 and Robert Mader committed May 27, 2023

We currently lock the capability of the MetaOrientationManager to emit
the ::orientation-changed signal, but otherwise keep reading the current
orientation and returning it if we are asked politely through
meta_orientation_manager_get_orientation().

This may bring issues e.g. around suspend/resume, since there may be other
parts of the code trying to get the current orientation without receiving
::orientation-changed signals, this may result in the display orientation
being effectively rotated, then stay locked after that.

In order to fix this, make the MetaOrientationManager return a fixed
orientation while locked, only updated after changes in the lock state.

Closes: #2600
Part-of: <!3021>

(cherry picked from commit b5900dd9)