D28517: Send notification when screencasting fails

[Carson Black]

cblack created this revision.
cblack added reviewers: Plasma, VDG.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
cblack requested review of this revision.

REVISION SUMMARY
  A notification is sent when something
  goes wrong setting up screencasting.

TEST PLAN
  F8211696: screencast error.png <https://phabricator.kde.org/F8211696>

REPOSITORY
  R838 Flatpak Support: KDE Portal for XDG Desktop

BRANCH
  cblack/screencast-notify-error (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D28517

AFFECTED FILES
  src/screencaststream.cpp

To: cblack, #plasma, #vdg
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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