Sizing fix in wxRichTextImage::LoadImageCache


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75887 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
mimic wxMSW wxSetCursorEvent propagation behavior, closes #15801

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75888 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775