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The low color is not being set correctly when text is selected -- it remains white while the selection background is gray. This is causing crud to appear because of incorrect antialiasing. This was observed in 0.7.8
I'm not sure what you mean by low color here. On my machine (admittedly not Be), the colors appear properly for selections, regardless of font color. I have not seen any screen dirt.
This is a BeOS specific UI bug -- BViews have a high color (foregroundfor drawing) and low color (background -- which is used to antialiastext drawn, etc). If the low color is not set correctly, (eg it isleft as white while drawing text on say a gray backrgound), the antialiasing will be incorrect.
Changing platform to Be for BeOS related bug.
'Fixed' by changing the text drawing code to use B_OP_OVER (so the low colour is still wrong, but it's no longer an issue). This might be too slow, but it's impossible to tell - the text drawing is too slow anyway. We'll see when we come to optimise text drawing code (Real Soon Now).