Guard against trying to use extend() with None

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75454 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add the ability to show a CallTip in the stc sample.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75455 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Document ctors and dtor for wxListView

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75456 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add wxWebKitCtrl header.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75457 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Slight tweaks for the wxWebKitCtrl doc.
Remove inline function bodies.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75458 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add missing wxMenuItem methods

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75459 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775