Recompute the tooltip width when changing its text in wxMSW.

This avoids unnecessarily wrapping the tooltips if they are set to a longer
string than their initial value later.

Closes #4685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75758 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
restore non-default cursors in native widgets when unsetting wxCursor

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75759 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775