Previous code used custom regular expressions to extract URLs, hashtags,
and mentions from text while the user was writing a post. These were
inconsistent with the ones that Mastodon uses so the derived character
count could be wrong.
As well as being visually incorrect this could prevent the user from
posting a status that was within the length limit, or allow them to
attempt to post a status that was over the length limit (which would
then fail).
Fix this by dropping the homegrown regular expressions and using the
same text parsing library that Mastodon users; twitter-text. This has
been converted to Kotlin and the functionality related to Twitter
specific features has been removed.
The hashtag handling has been adjusted, as Mastodon is more permissive
about the positions where hashtags can appear than Twitter is, in
particular, a hashtag does not need to be preceded with whitespace if
the tag appears after some scripts, such as Hirigana.
Android's choices for font customisation can be limited, depending on
the vendor. Allow users to choose from a small collection of embedded
fonts, chosen by asking users for recommendations.
The font choice is implemented as a preference. Provide a custom dialog
that shows the fonts (in that font) so the user can see what they're
choosing between.
Ensure the font's license information is displayed in the "About"
section.
The previous code did not credit all third party code used in the app,
or provide access to the licenses.
Fix this by adopting the "aboutlibraries" library, which processes
dependencies at build time and generates a list of dependencies,
versions, and license information to display to the user.
Use this to also ensure that the non-source dependencies (artwork,
emoji) are given appropriate credit.
