D29344: [applets/systemtray] Fix ivisible plasmoid icons when new plasmoid added

[Konrad Materka]

kmaterka created this revision.
kmaterka added reviewers: Plasma: Workspaces, Plasma, ngraham.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
kmaterka requested review of this revision.

REVISION SUMMARY
  After adding a new plasmoid (applet), for example a new Media Player, several empty icons are rendered in the system tray which hides existing icons.
  The bug occurs after opening Gwenview while the Media Player applet is NOT in use.
  The systray icons reappear when Gwenview is closed or another source starts playing.
  
  BUG: 418662

TEST PLAN
  Start Gwenview when Media Player is not in use. All icons should render correctly.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D29344

AFFECTED FILES
  applets/systemtray/package/contents/ui/items/ItemLoader.qml
  applets/systemtray/package/contents/ui/main.qml
  applets/systemtray/systemtraymodel.cpp

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