This takes care of several minor annoyances:
* centralizes all the text processing functions which have been
floating all around the code, and adds proper tests
* filters out invisible elements (sometimes used for metadata)
* avoids merging separate words on HTML->text transformation
* adds caching since doing all this transformations could be
processing-intensive for big chunks of HTML. (This might or
might not be a good idea. I haven't done performance tests, so
this might be premature optimization, and increases memory use.
OTOH these functions are often called in situations where an
immediate UI response is expected (such as selecting a size
from the list) so even small delays would be perceivable.
Bug: 63126
Change-Id: I1ef1e3a33efdfea17612df00da6b629bf39e07aa
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/388
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/369
Fades out the bottom of the text and adds a link to replace it
with the full HTML version. Due to the way it is positioned,
the fade + link will be invisible if the text is less then 3 lines.
The implementation is not very polished; since this will be
replaced by some JS-based ellipsis thing, I didn't want to spend
too much time on it.
Change-Id: Ib30e40fe845b85bfcf9557970efb886d28b3e5c7
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/118
