Implemented collapsed borders for wxRTC


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74936 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Don't call SetDllDirectory() when loading dynamic libraries in wxMSW.

SetDllDirectory() modifies the per-process DLL loading behaviour which is
already unexpected as it can affect other threads, running code completely
unrelated to wxWidgets, but, even worse, we can't undo its effect as calling
SetDllDirectory(NULL) as we used to discarded any changes to the DLL directory
done by the program itself, while restoring the result of GetDllDirectory()
would never restore the "compatible" algorithm for DLL search used by default.

So the simplest, and the only 100% correct solution, is to not call this
function at all from here and call it from some higher level code only, either
in the user application or wxPython itself.

Closes #15534.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74937 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Replace c_str() with t_str() in wxWinCE code.

This should work correctly even in UTF-8 build, should someone want to use it
under Windows CE.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74938 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Don't skip handled mouse wheel events in wxVScrolledWindow.

Make the code consistent with wxScrolledWindow and fix the problem with wheel
events always being skipped by wxVScrolledWindow which could result in
processing them multiple times, e.g. for the window itself and its parent as
it happened with wxPGChoiceEditor cells in wxPropertyGrid.

Closes #15547.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74939 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775