Further refine of #15226: wxRichTextCtrl: Implement setting properties with undo for objects e.g. wxRichTextTable (dghart)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74910 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Go back to using a fixed value of 3 for lines/columns per action for mouse wheel event.
The native value is too large. Reverts the effect of r74805. Closes #15527


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74911 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775