Add code for setting/restoring background mode and use it to implement support for changing the text background colour. Closes #14443. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72589 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add code for setting/restoring background mode and use it to implement support for changing the text background colour. Closes #14443. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72589 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775