Disquieting that none of my tests caught these. On the other hand, I
also haven't noticed any issues in practice. Perhaps cache invalidation
is often unnecessary.
The published version of lines.love was broken for almost an hour. The
cursor would render one position to the right of where it really is. To
fix it, this commit rolls back 26ba6e4e5a. There doesn't seem a good
way to test it.
I've been sloppy about this so far, and outside of tests I can't find
any examples where it matters, but it matters in a potential fork where
I'm rendering multiple columns of text.
It's unfortunate that my tests have this level of brittleness. What I'd
really like to assert in many of these changed lines is that the text
stays inside the margins and that more text would overflow margins.
I can't believe I didn't catch this until now. All I had to do is open
MobyDick.markdown from https://www.hogbaysoftware.com/posts/moby-dick-workout,
press page-down and click on the top screen line (or any screen line
containing the same line as the top screen line). Easy to catch with any
file containing lots of overly long lines, as happens in particular at
the start of Moby Dick.
I _had_ seen this problem before, but it seemed to disappear after
unrelated changes, and I convinced myself I'd fixed it as a side-effect.
The bug just failed to manifest if the top line happened to start at the
top of the screen. Scroll down a few pages in Moby Dick and the dialogue
starts and line length drops precipitously.
Bugfix: we want selections to persist even when we lift up the shift
key.
This requires hoisting some code inside every case inside the whole
keypress hierarchy, to ensure we never clear selections before
textinput events can handle them.
Current cross-cutting concerns we're explicitly scattering code for.
- autosave
- undo
- selection management
To reproduce:
click to position cursor at end of a line
hit enter
press any key
before:
newline got erased and key got added to previous line
now:
newline is preserved
The new test checks a generalization of this.
Kartik K. Agaram