D23036: Fix incorrect initial tabs position for vertical tab bars

[Konstantin Lisin]

lisin added a comment.


  I didn't make a third copy of the positioning code, instead I put it all into a separate function.
  
  For Kickoff you can test the changes like this:
  Place Kickoff in a vertical panel. Restart plasmashell. Open Kickoff.
  Before fix: first tab is placed out of bounds (y < 0).
  After fix: first tab is positioned correctly (y = 0).
  
  As far as I see, other applets that use PlasmaComponents.TabBar (like Activity Bar, Grouping widget etc) weren't affected by the bug and they still work the same.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D23036

To: lisin, #plasma, ngraham
Cc: kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns
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