Nyall Dawson 8c429a5806 Fix some race conditions in QgsTileDownloadManager
Avoid modifying the queue while we're in the middle of iterating
over it.

(cherry picked from commit c650c0e7d954f8f360b1943ca3ca167626658a77)
2022-08-24 11:14:23 +10:00
..
2022-08-10 13:55:43 +10:00