roc+%cs.cmu.edu fe7bb3975b Bug 256311. Improve block reflow performance in the presence of many empty lines, by being more aggressive about caching block and line emptiness state, and by stashing a reference to a line that we know has nothing but empty lines above it. Relanding because I accidentally backed it out. r+sr=dbaron ...

git-svn-id: svn://10.0.0.236/trunk@191298 18797224-902f-48f8-a5cc-f745e15eee43

2006-02-27 04:15:05 +00:00

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