D7162: KSqueezedTextLabel: Add isSqueezed() for convenience

[Henrik F .]

rkflx added a dependent revision: D7163: KSqueezedTextLabel: Add several 
autotests.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D7162

To: rkflx, #frameworks