Don't select into virtual space for SCI_LINESCROLLDOWN/UP. Bug #3451681.
Don't select into virtual space for SCI_LINESCROLLDOWN/UP. Bug #3451681.

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