[Backport queued_ltr_backports] qgs3daxis: Correctly delete axis or cube in the destructor #57933
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In the desctrutor, `mAxisRoot` or `mCubeRoot` may have already been freed by Qt. In that case, a `isEnabled()` call will create a segmentation fault. By checking the axis mode, this allows to properly know which objects needs to be deleted. Fixes commit b578f1e
nyalldawson
approved these changes
Jun 28, 2024
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Backport #57927
Authored by: @ptitjano