fix invisible multi-line wxTextCtrl selection when custom foreground/background color is used with GTK3
closes #16176


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76308 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
build fix for wxUSE_THREADS==0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76309 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
build fix for wxUSE_DRAG_AND_DROP==0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76310 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
build fix for wxUSE_TOGGLEBTN==0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76311 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fixes to the previous Nepalese translation update.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76312 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
build fix for wxUSE_VALIDATORS==0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76313 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
build fix for wxUSE_VALIDATORS==0 when NULL is defined to be nullptr
casting nullptr is not allowed

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76314 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775