Commits on Feb 20, 2024

1. Fix a deadlock with local COPC files in 2D rendering …

   Follow up of qgis#56388
   
   It was possible to trigger a deadlock when using a local COPC file
   by zooming in/out while there was 2D rendering happening - this caused
   a situation where point cloud index was trying to recursively lock
   a mutex that the same thread has already locked.
   
   fetchNodeHierarchy() for local COPC files now unlocks the mutex before
   calling fetchHierarchyPage() just like what happens with remote COPC files.
   
   While fixing that, I have removed now duplicate code between the local and
   remote COPC support. The logic for dealing with hierarchy mutex should
   be clearer now as well - we do not call other functions of the index
   with mutex locked.

   

   wonder-sk committed Feb 20, 2024
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