D27481: [WIP]Panel spacer that can center things

[Marco Martin]

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

REVISION SUMMARY
  - Make the panel spacer take a lot more space when is in expanding mode, so much
  
  to "win" against the taskbar and collapse it to its minimum size (seems the
  most expected behavior after some discussions in vdg channel)
  
  - make it paint a background when in edit mode
  - when two spacers are present in the panel, they try to center all the content
  
  that is in between them (if possible), so that is always at the center of the panel,
  even if there is more content on one side rather than the other

REPOSITORY
  R120 Plasma Workspace

BRANCH
  mart/panelSpacer

REVISION DETAIL
  https://phabricator.kde.org/D27481

AFFECTED FILES
  applets/CMakeLists.txt
  applets/panelspacer/CMakeLists.txt
  applets/panelspacer/Messages.sh
  applets/panelspacer/contents/config/main.xml
  applets/panelspacer/contents/ui/main.qml
  applets/panelspacer/metadata.desktop
  applets/panelspacer/package/contents/config/main.xml
  applets/panelspacer/package/contents/ui/main.qml
  applets/panelspacer/package/metadata.desktop
  applets/panelspacer/plugin/CMakeLists.txt
  applets/panelspacer/plugin/panelspacer.cpp
  applets/panelspacer/plugin/panelspacer.h

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