jgrulich added a comment.
I have now a new version using KFileWidget and it still suffers from the same problem. It does filter properly when I use regexp, but the "automatic extension" feature will add the file extension unmodified so it results into the same problem. It looks that my workaround will be needed anyway. REPOSITORY R838 Flatpak Support: KDE Portal for XDG Desktop REVISION DETAIL https://phabricator.kde.org/D17677 To: jgrulich, broulik Cc: heikobecker, ngraham, davidedmundson, plasma-devel, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart