Fix for Bug #2825485, paste in read-only mode sends EN_CHANGE despite no change taking place.
Fix for Bug #2825485, paste in read-only mode sends EN_CHANGE despite no
change taking place.

rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror