Un-list selection seems to hang the page

[garrettlancaster]

Steps to Reproduce:

1. Enter several lines in a textarea and highlight them

some line
another line

1. Select the unordered list button to transform into list
2. Then hit the unordered list button again to reverse the transformation; page hangs

Details: Chrome Version 26.0.1410.65 (latest) on OS 10.7

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