fix: Render hashtags, mentions, and initial paras correctly in RTL

[nikclayton]

Previous code didn't set the textDirection for the status content, so the first para of RTL text might be rendered incorrectly.

In addition, mentions and tags weren't BIDI wrapped, so would appear as "foo@" and "foo#" in RTL statuses, instead of "@foo" and "#foo".

Fix both of these issues.

Fixes #870

[NeatNit]

Thanks for the fix, I'll test it out when the next update hits F-Droid :)

I suspect it'll be over-eager to switch to RTL. According to https://developer.android.com/reference/android/view/View.html#attr_android:textDirection (emphasis mine):

anyRtl 2 The paragraph direction is RTL if it contains any strong RTL character

It looks to me like firstStrong (the default) is the desired behavior, it just needs to ignore the isolated substring. Is unicodeWrap not sufficient on its own?

If my reading is right, anyRtl will make a post like this unreadable:

I like the letter י because it's so small

[nikclayton]

Good point, and thanks for the example. Fixed with #910

[NeatNit]

Just got the update, all seems good :)