Bug #3494202. Fix blurry RGBA markers on Direct2D when centring caused fractional coordinates.
Bug #3494202. Fix blurry RGBA markers on Direct2D when centring caused
fractional coordinates.

R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone