D24885: [kcmkwin/kwindecoration] Elide "theme default border size" CheckBox

broulik created this revision.
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REVISION SUMMARY
  Otherwise the layout explodes.
  Unfortunately it seems Layouts don't shrink the items within even if there's not enough room at all, so I need this `fillWidth` + `maximumWidth` workaround.

TEST PLAN
  Ideally, we'd wrap into a separate line or something but this requires more refactoring as a `RowLayout` can't do that on the spot, and a `Flow` doesn't give us the nice auto-sizing capabilities of a `Layout` :(
  For 5.17 this is better than exploding the grid view outside visible bounds
  Before
  F7656362: Screenshot_20191023_133516.png <https://phabricator.kde.org/F7656362>
  After
  F7656368: Screenshot_20191023_133610.png <https://phabricator.kde.org/F7656368>

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D24885

AFFECTED FILES
  kcmkwin/kwindecoration/package/contents/ui/main.qml

To: broulik, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart