Carl Hetherington 1a44701643 Fix a couple of crashes with empty matrices. Some small optimisations. ... Correctly handle descenders on text when plotting labels. Minor layout improvements. Add some drawings of what's going on in the port matrix so that I don't keep losing them. git-svn-id: svn://localhost/ardour2/branches/3.0@6319 d708f5d6-7413-0410-9779-e7cbd77b26cf		2009-12-07 00:41:50 +00:00
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port_matrix
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