tabatkins/bikeshed — pull request #172 by mikewest (2014-06-02 08:15:30+00:00)
Title: Correctly collapse indented-<pre> whitespace.

's whitespace collapsing behavior should be based on the first line
of the block, rather than on the indentation of the opening

tag.
That is:

Text text text.

Should generate:

Text text text.

Pre pre pre

This patch modifies `transformPre()` to grab the prefix from the first
inner line of the block, rather than |startLine|.