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[Łukasz Zemczak <1380702@xxxxxxxxxxxxxxxxxx>]

Ok, identified the initial problem here. It's not any recent problem -
it's an issue that seems to be with appmenu-qt5 and Qt5 since the very
beginning. It's not really a bug in appmenu-qt5, more like a design
decision that Qt5 had that I wasn't aware of.

The main problem here is that once we load up the QPA platformtheme and
the QMenuBar object is able to create the QPlatformMenuBar instead, what
it does is it hides the original QMenuBar (doing w->hide()). In Qt5 a
hidden menubar (and probably any other widget/ui object) does not get
any events when being hidden. appmenu-qt5 is a simple plugin that
doesn't do any of that handling. Actually I'm not even sure if it's
easily possible to add shortcut handling to a QPlatformMenuItem - the
QAction wrapper around platformtheme plugins. I'll look into that in
detail tomorrow, maybe we might be able to resolve this somehow without
patches upstream.

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https://bugs.launchpad.net/bugs/1380702

Title:
  No keyboards shortcuts in QT apps

Status in appmenu-qt5:
  In Progress
Status in Canonical System Image:
  Confirmed
Status in sni-qt:
  New
Status in Ubuntu:
  Confirmed

Bug description:
  In some apps built using QT4 & 5, menu shortcuts are greyed out and
  inoperant. Only alt and FKeys-based shortcuts work. Others, notably
  ctrl+c for copying, do not.

  This is quite serious ; mail me for more details.

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