The standard double-click-and-hold gesture to initiate a selection that expands with word granularity rather than single character granularity does not work in the source view of the Resources pane in r54084. It works correctly in a WebKit build from earlier in the week.
<rdar://problem/7594395>
Fixed in http://trac.webkit.org/changeset/54133. https://bugs.webkit.org/show_bug.cgi?id=34400