Macos qt drag and drop fix

[daschuer]

This aims to fix the drag and drop issue reported here: mixxxdj/mixxx#4717

This PR is on top of #45

[fwcd]

I have filed https://bugs.launchpad.net/mixxx/+bug/1978384 for this, before I saw that you already looked into this. Thanks!

Since we won't get around patching the Qt build in the Intel version either now, we could probably upstream the M1 patches, even if Mixxx doesn't choose to officially provide binaries for ARM macOS, right?

[daschuer]

Since we won't get around patching the Qt build in the Intel version either now, we could probably upstream the M1 patches, even if Mixxx doesn't choose to officially provide binaries for ARM macOS, right?

Yes, but lets go in steps.

[fwcd]

I can confirm that the drag-n-drop patch works as expected (with the minor caveat that drag ghost images always seem to appear in the window's top left corner when dragging multiple tracks, this does not impact the actual functionality though and should not block the PR).

[daschuer]

Nice news, thank you.

[daschuer]

@Swiftb0y: can you have a brief look here? We may merge this at one or the clean up PR first. This one applies upstream patches from QT 5.15

[daschuer]

@Swiftb0y This is now rebased to 2.4, ready for review.

[Swiftb0y]

Thank you. I don't quite understand what I'm looking at though. The two patch files, where did they originate from?

[daschuer]

They are taken form here:
qt/qtbase@52e9c8b
and
qt/qtbase@8481a9f

[Swiftb0y]

Ok thanks for clarifying.