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f47ddbc3b0
This is the line number side of ecddf8468f (from #21924, fixing #21818).
But the code is slightly improved for both cases: instead of testing
that `leaf` is defined, check whether `lineCount` is zero, and if it is,
return `〈1,0〉` for the one-based line and zero-based column numbers.
(The requirement of `lineCount > 0` is also seen in the fact
that `lineNumberToInfo` expects a "*One*BasedLine" argument.)
I've stared at this code way too much, since I think that there is
something more fundamentally wrong here. E.g., `EditWalker` only
`push`es to `startPath` but never pops even a `children`-less node that
is left after deleting the whole contents. But I can't figure out the
overall structure, which is also why the test that I added is not
great (see the comment there; also, #21924 is dealing with the same
problem and didn't add a test).
Fixes #44518.