Fixed selection bug.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75107 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fixed print preview glitch and vertical cell alignment.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75108 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Corrected multiple cell property editing

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75109 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775