Copy of change 3284 for macosx platform: maximum alpha is 255, not 100.
Copy of change 3284 for macosx platform: maximum alpha is 255, not 100.

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