Strange focus (and controller initialization) behavior after launch on macOS when external monitors are attached

[mixxxbot]

Reported by: fwcd Date: 2022-05-21T00:50:19Z Status: New Importance: Undecided Launchpad Issue: lp1974962 Tags: controllers, gui, macos Attachments: [Demo of the focus issue](https://bugs.launchpad.net/bugs/1974962/+attachment/5591669/+files/Demo of the focus issue), [Mixxx Logfile](https://bugs.launchpad.net/bugs/1974962/+attachment/5591888/+files/Mixxx Logfile)

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After launching Mixxx on macOS the application seems to be in a strange state:

• The window is not focused
• After clicking the window, Mixxx exhibits a range of UI inconsistencies:
  • There are no focus rings around selections in the library
  • There is no caret (and no focus ring either) in the search field
• Additionally connected DJ controllers do not seem to be initialized correctly:
  • Mixxx's faders are not initialized to the controller state until the mapping is explicitly reloaded (although adjusting a fader on the controller seems to at least update that fader in Mixxx)
  • The rotary control for browsing the library does not do anything

Tabbing out of Mixxx and back in fixes the aforementioned issues, this launch behavior is of course still non-ideal. Any ideas?

I have attached a video showcasing the issue.

Mixxx: 2.3.2 OS: macOS 12.3.1 Arch: ARM64 (M1 Pro)

[mixxxbot]

Commented by: fwcd Date: 2022-05-21T00:50:19Z Attachments: [Demo of the focus issue](https://bugs.launchpad.net/mixxx/+bug/1974962/+attachment/5591669/+files/Demo of the focus issue)

[mixxxbot]

Commented by: fwcd Date: 2022-05-21T14:01:57Z

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The issue only seems to occur when external monitors are attached.

Edit: From experimenting around it seems to only occur when Mixxx is opened on an external monitor, not in general when external monitors are present. Also this doesn't seem to be limited to ARM/M1 Macs, it occurs on Intel Macs too.

[mixxxbot]

Commented by: Swiftb0y Date: 2022-05-21T17:12:12Z

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Can you also post the logfile from when this issue occurs? https://github.com/mixxxdj/mixxx/wiki/Finding%20the%20Mixxx.log%20file Thanks.

[mixxxbot]

Commented by: fwcd Date: 2022-05-22T01:44:45Z Attachments: [Mixxx Logfile](https://bugs.launchpad.net/mixxx/+bug/1974962/+attachment/5591888/+files/Mixxx Logfile)

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Sure! This is the log for a launch of Mixxx (on an external monitor) that produces this issue.

[fwcd]

This seems to be a Qt bug, possibly limited to macOS, that occurs when using Qt 5.12.4 (the version we currently use), not on Qt 5.12.12, however. That is, the bug must have been fixed somewhere between Qt 5.12.4 and 5.12.12.

A Mixxx build for arm64 macOS using Qt 5.12.12 can be found here: https://github.com/fwcd/m1xxx/actions/runs/3210912252.

Unfortunately, the waveform performance issues already occur in Qt 5.12.12, so we can't just upgrade to 5.12.12. We may either have to backport the corresponding patches or bisect the Qt releases for a version that fixes the issue and doesn't have the performance issues yet.