MDI Interface bug with Ubuntu Unity

[tresf]

As seen in the above picture, there is a bug with QMdiArea and Ubuntu's Unity interface which puts the Minimize/Restore/Maximize buttons in the upper left corner of LMMS (instead of the upper right) and erroneously attaches it to a movable toolbar.

I couldn't find anywhere on the internet explaining this QT/Unity combination behavior, but @tobydox suggested it was due to the Unity menu relocation, and eventually stumbled upon this article https://wiki.ubuntu.com/DesktopExperienceTeam/ApplicationMenu#Troubleshooting in the "Kubuntu Desktop Installation" provides the hint, which allows QT applications to disable the Desktop Environment from rendering it's own native menubar:

QT_X11_NO_NATIVE_MENUBAR=1 lmms

or for the .desktop file:

[Desktop Entry]
Exec=env QT_X11_NO_NATIVE_MENUBAR=1 lmms

Ubuntu 14.04 beta x86

NOTE! The env parameter is REQUIRED in the desktop shortcut, but not in terminal.

Before applying this patch, we should hear from other X11 based Desktop Environment users after testing this feature.

Is anyone running another X11 Desktop Environment that is able to try this? Please chime in if you can help test this!

[tresf]

This is a go for Cinnamon 2.0, KDE and LXDE (and obviously Unity) which should cover most use-cases.

@diizy, if you agree, can you commit Exec=env QT_X11_NO_NATIVE_MENUBAR=1 lmms to the .desktop file in your branch?

https://github.com/diizy/lmms/blob/stable-0.4/data/lmms.desktop

I think this is well needed patch for 1.0.0 as it's a small fix and it has a very positive impact on the Ubuntu desktop experience without breaking other Ubuntu derivative desktops.

Tested QT_X11_NO_NATIVE_MENUBAR=1 lmms setting with:

KDE/Kubuntu 14.04 x86 nightly
LXDE/Lubuntu 14.04 x86 nightly

In both cases, this menubar setting had no impact on the actual menubar within LMMS. Both desktops behaved normally both WITH and WITHOUT this setting applied. Screenshots provided for evidence:

LXDE with QT_X11_NO_NATIVE_MENUBAR=1 lmms setting

KDE with QT_X11_NO_NATIVE_MENUBAR=1 lmms setting

KDE, LXDE and Unity tests were performed using deb http://ppa.launchpad.net/israeldahl/lmms-testing/ubuntu trusty main

-Tres

[diizy]

On 03/20/2014 03:46 PM, Tres Finocchiaro wrote:

This is a go for Cinnamon 2.0, KDE and LXDE (and obviously Unity)
which should cover most use-cases.

@diizy https://github.com/diizy, if you agree, can you commit
|Exec=env QT_X11_NO_NATIVE_MENUBAR=1 lmms| to the .desktop file in
your branch?

done

[diizy]

Closing this since the fix has been merged

[PhysSong]

Recently I investigated this issue again. QT_X11_NO_NATIVE_MENUBAR is related to the appmenu-qt package which unsets Qt::AA_DontUseNativeMenuBar attribute. However, the package only affects Qt4 apps.

[tresf]

This bug report suggests Qt5 honors Qt::AA_DontUseNativeMenuBar since 5.6.1. https://bugreports.qt.io/browse/QTBUG-28960

@PhysSong are you suggesting we switch to this method? If so, this bug report should be reopened.

[tresf]

Also, this should be a Linux-only (or Unity-only) setting. MacOS doesn't suffer the same MDI window problems when the menu is removed..

[PhysSong]

FYI, Qt5 + Unity gives this result:

[tresf]

Same. So I guess this isn't really an issue any longer because the original bug has been suppressed.