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The quick exit test on end% was using the xpos of the gate start, which would
be the start of the bar to the left, when it should be using the rightmost
note drawn (of the not-yet-complete bar). This meant if you placed a few notes
they could be rubbed away with another window until the bar line was added.

Ref: https://www.riscosopen.org/forum/forums/4/topics/18698

Version 2.20. Tagged as 'Maestro-2_20'