Fix warnings about implicit float or double to int conversions in wxMSW.

Make the conversions explicit as these warnings are harmless.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74491 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Make destructors of COM interface classes virtual.

This is needed to at least silence g++ warnings but may actually even fix a
real problem as these classes can be inherited from and are deleted via a
pointer (to "this" itself, in Release() implementation).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74492 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix wrong return value from wxWebViewIE::Find() in 64 bit build.

Using wxNOT_FOUND and an unsigned size() return value in the same operator ?:
resulted in wxNOT_FOUND being converted to an unsigned size_t type and while
converting it back to (signed) long worked in 32 bit builds where long and
size_t have the same size, it was broken in 64 bit builds where their sizes
are different.

Thanks g++ for catching this one.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74493 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix harmless unused parameter warning in !wxUSE_GRAPHICS_CONTEXT build.

Rich tooltip tip kind is unused as no tip is drawn in this case.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74494 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix harmless MinGW warning in wxMSW wxListCtrl code.

Add an explicit cast to WPARAM because MinGW headers don't do it for us (even
though they should).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74495 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775