Converter: fix layout error in Missing Properties dialog. Use AutoSize.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46749 4005530d-fff6-0310-9dd1-cebe43e6787f
Anchordocking: Use a different way to free unneeded controls.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46750 4005530d-fff6-0310-9dd1-cebe43e6787f
AnchorDocking: add missing EnableAutoSizing in TAnchorDockHostSite.Merge.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46751 4005530d-fff6-0310-9dd1-cebe43e6787f
AnchorDocking: Fix loop in TAnchorDockHostSite.Merge.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46752 4005530d-fff6-0310-9dd1-cebe43e6787f