D17677: Add workaround for gtk file chooser filter patterns

[Jan Grulich]

jgrulich created this revision.
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REVISION SUMMARY
  Gtk can use filter patterns, looking like "*.[Pp][Nn][Gg]" to handle all possible lowercase/uppercase
  variants. This is unfortunately not supported by KDE/Qt dialogs so we should try to convert it to
  just "*.png" instead. There are other possible patterns, but this is probably the most common one.

REPOSITORY
  R838 Flatpak Support: KDE Portal for XDG Desktop

BRANCH
  Plasma/5.14

REVISION DETAIL
  https://phabricator.kde.org/D17677

AFFECTED FILES
  src/filechooser.cpp

To: jgrulich
Cc: plasma-devel, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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