corrected the bottom/right corner color for RichView.
corrected the bottom/right corner color for RichView.

It's the rectangle between the two scrollbars.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI