With the current master (unless you have diabled the glyph cache you can 
get blank parts of the screen when you scroll horizontally. I suspect 
the glyph cache is not getting updated properly - is the 0xFF command in 
a the data of a GlyphIndex order being processed/passed to the client 
machine properly.

----

The test setup was using xrdp as a SSO proxy from windows XP to 2003 
server. The display was set to 640*480. notepad was used to open a text 
file that has 512 lines in it folling this pattern.


0
01
012
0123
01234
012345
0123456
01234567
012345678
010 456789
011 4567890
012 45678901
013 456789012
014 4567890123
015 45678901234
016 456789012345

So line 512 has 512 characters.

If you scroll down to around line 220 and then use keyboard arrow keys 
to left from start of line to end of previous line you will see some 
blank space.

Lawrence.

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