Fix incorrect initial tabs position for vertical tab bars

Authored by lisin on Aug 9 2019, 2:03 AM.

Description

Fix incorrect initial tabs position for vertical tab bars

Summary:
This fixes the incorrect initial positioning of the tabs for vertical
tab bars that persisted until the user switched to another tab
manually.

BUG: 395390
FIXED-IN: 5.62

Reviewers: Plasma, ngraham, hein

Reviewed By: Plasma, ngraham, hein

Subscribers: kde-frameworks-devel

Tags: Frameworks

Maniphest Tasks: T10047

Differential Revision: https://phabricator.kde.org/D23036