Add a virtual dtor to wxEventLoopSourcesManagerBase to avoid g++ warnings.

This virtual dtor is not really needed as manager objects are static
singletons and are not destroyed via their pointer, but add a virtual dtor
just to avoid g++ warnings about its absence.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75666 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Move deprecated wxFont ctor implementation out of line.

Blind fix to avoid strange warnings given by OS X build slave about the ctor
being deprecated when it's defined, not used.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75667 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix best size calculation with GTK3
GTK3 reports preferred size of hidden widgets as zero.
see #15896


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75668 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775