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Implement forwarding file dialog requests to xdg-desktop portal

Jonah Brüchert requested to merge jbbgameich/plasma-integration:feature/xdg-desktop-portal into master

Implement forwarding file dialog requests to xdg-desktop portal

This is activated per default on mobile devices. Contains a code copy from the xdgdesktopportal Qt platform theme. The file can be found in src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportalfiledialog.cpp of the qtbase source tree.

A few fixes to the file were necessary to fix compilation with our compiler settings:

  • explicit QUrl from QString conversion
  • explicitly convert c string to QString
  • Don't initialize QString from nullptr, use {} instead

The portal forwarding can be activated by setting the PLASMA_INTEGRATION_USE_PORTAL environment variable to 1

Edited by Jonah Brüchert

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