Summary:
This commit also fixes snippets for HTML-only messages to strip out HTML
tags, and makes us preserve whitespace for plaintext emails by
displaying them in <pre class="nylas-plaintext"> tags, and makes us log
messages that fail to parse at all to a tempdir.
The only issue I found with using <pre> tags for plaintext email was
that some lines may trigger scrolling, so there is an associated commit
(D3484) that changes the CSS for <pre class="nylas-plaintext"> to wrap
lines.
In the future, we can add regression tests to this test suite whenever
we fix parsing bugs.
Test Plan: unit tests included
Reviewers: bengotow
Reviewed By: bengotow
Differential Revision: https://phab.nylas.com/D3483
