Pass non-primitive types by const reference instead of value.

No real changes, just avoid the unnecessary copying and also make the
signatures more consistent by adding the apparently forgotten "&" in a couple
of places.

See #15893.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75657 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/richtext/richtextctrl.cpp

@@ -2985,7 +2985,7 @@ wxRichTextCtrl::HitTest(const wxPoint& pt,
 }
 
 wxRichTextParagraphLayoutBox*
-wxRichTextCtrl::FindContainerAtPoint(const wxPoint pt, long& position, int& hit, wxRichTextObject* hitObj, int flags/* = 0*/)
+wxRichTextCtrl::FindContainerAtPoint(const wxPoint& pt, long& position, int& hit, wxRichTextObject* hitObj, int flags/* = 0*/)
 {
     wxClientDC dc(this);
     PrepareDC(dc);