D22886: [kcmkwin/kwindecoration] Slightly improve tab bar's integration with frame

[Filip Fila]

filipf accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R108 KWin

BRANCH
  slightly-improve-fake-tabbar (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D22886

To: ngraham, #kwin, #vdg, filipf
Cc: kwin, LeGast00n, fmonteiro, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart
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