Indent action is inconsistent when paragraph is split with BR tags

Using the live demo at http://guardian.github.io/scribe/ in Chrome 41 on Windows 8:

Step 1. Type test three times:

test
test
test

Which results in this HTML:

<p>test</p><p>test</p><p>test</p>

Step 2. Select all the text, then press H2 twice, which results in this HTML:

    <p>test<br>test<br>test</p>

Step 3. Press indent, results in this HTML:

    <blockquote><p>test</p><p>test</p><p>test</p></blockquote>

However, the selection now only extends to the "te" in the final "test", the "st" is unselected. Presumably due to the conversion from br to p tags.

Step 4. Press Outdent, results in this HTML:

    <p>test</p><p>test</p><p>te</p><blockquote><p><br></p><p>st</p></blockquote>

The "st" which ended up becoming deselected is still indented. Expected result is the html after step 1, with just three paragraph tags. The html at step 2 should probably match the html after step 1 too.