[Backport queued_ltr_backports] Avoid a redundant calculation of visible layer extent in overview canvas #50336
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This was being called twice immediately in a row, and the first time was skipping the "isVisible" check used before the second call. As a result we were ALWAYS recalculating the full extent of the project with every layer set change, even when the overview canvas was not open (and this is non-trivial for very large projects!) On one test project this reduces a multi-second pause when checking/unchecking layers/groups in the tree to no pause.
alexbruy
approved these changes
Sep 26, 2022
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Backport #50329
Authored by: @nyalldawson