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[Bug 1814613] [NEW] qmlscene -style material file.qml says "QApplication: invalid style override passed"

To: ubuntu-sdk-bugs@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1814613@xxxxxxxxxxxxxxxxxx>
Date: Tue, 05 Feb 2019 11:27:33 -0000
Reply-to: Bug 1814613 <1814613@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

You have been subscribed to a public bug:

qmlscene -qt=5 -style material file.qml
prints
  QApplication: invalid style override passed, ignoring it.
on the terminal.

This does not happen when using the environment variable method, e.g.
  QT_QUICK_CONTROLS_STYLE=material qmlscene -qt=5 file.qml

The documentation for how this is supposed to work is at
  https://doc.qt.io/qt-5/qtquickcontrols2-styles.html#using-styles-in-qt-quick-controls-2

I'm reporting this to ubuntu because it might be due to packaging or
patching done for Ubuntu.  I can not conveniently try a pristine
upstream version of Qt, so hoping the Qt Ubuntu maintainer can quickly
determine if this is an upstream bug or not.

I'll attach a trivial test file which demonstrates the problem

STEPS TO REPRODUCE:
  qmlscene -style material test.qml  # test.qml attached

ACTUAL RESULTS:
  Prints warning about invalid style on the terminal

EXPECTED RESULTS:
  Silent obedience

** Affects: qtdeclarative-opensource-src (Ubuntu)
     Importance: Undecided
         Status: New

-- 
qmlscene -style material file.qml says "QApplication: invalid style override passed"
https://bugs.launchpad.net/bugs/1814613
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