macOS requires QT_MAC_WANTS_LAYER=1 to show QGIS GUI

[jakimowb]

On macOS it has been observed that the QGIS GUI might not be shown, despite it can be started from the conda shell and a new item appears in the macOS dock.

This can be solved by exporting the environmental variable:

export QT_MAC_WANTS_LAYER=1

Preferably this will be fixed in Qt (#159 (comment)), however, until this happens, I think it is a good idea to keep this issue open, so that users can find this workaround easier.

If you don't mind @gillins, I can prepare a PR to mention this issue in the readme.md as well.

[gillins]

FYI there is some work underway ATM to upgrade Qt which includes the fix for Big Sur (conda-forge/qt-feedstock#189)

Happy to look at PR for readme.md in the meantime.

[amorfinv]

Thanks for this! Actually it only worked for me if I add quotes to the environment variable.

export QT_MAC_WANTS_LAYER="1"

[SrNetoChan]

@amorfinv Is this still true with the new 3.22 package?
@gillins Is this something we could change on our recipe to make this fix permanent?

[amorfinv]

Hello @SrNetoChan,

I no longer need this environment variable for 3.22. It works without it!

However, I still get many warnings.

Warning: Broken filename passed to function
Warning: Broken filename passed to function
Warning: Broken filename passed to function
Warning: Broken filename passed to function
Warning: Broken filename passed to function
Warning: Broken filename passed to function
Warning: Broken filename passed to function
Warning: Populating font family aliases took 214 ms. Replace uses of missing font family "FreeSans" with one that exists to avoid this cost.
Warning: Broken filename passed to function
Warning: Broken filename passed to function
Warning: Broken filename passed to function
Warning: QWidget::insertAction: Attempt to insert null action
Warning: QWidget::insertAction: Attempt to insert null action
Warning: QWidget::insertAction: Attempt to insert null action
Warning: Broken filename passed to function
Warning: QLayout::removeWidget: Cannot remove a null widget.
<string>:1: DeprecationWarning: setapi() is deprecated

[SrNetoChan]

As long its warnings... I am going to close this ticket. Please feel free to open a new one in case does warnings affect your work.