QT: Improve moving tabs of a PageControl from Zeljko.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@47253 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL: formatting.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@47254 4005530d-fff6-0310-9dd1-cebe43e6787f