Guard against trying to use extend() with None

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75460 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/branches/WX_3_0_BRANCH@75461 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Document ctors and dtor for wxListView

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75462 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Workaround for OSX crash in STC’s CallTip popup.  Revert this when the fix in #15765 is backported.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75463 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add wxWebKitCtrl header.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75464 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/branches/WX_3_0_BRANCH@75465 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add missing wxMenuItem methods

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75466 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
fix memory leak, closes #15785

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75490 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775