fix(treesitter): don't open fold when adding a line below it with o/O #28709
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Problem:
o
-ing on a folded line opens the fold, because the new line gets thefold level from the above line (level '='), which extends the fold to
the new line.
O
has a similar problem when run on the line below afold.
Solution:
Use -1 for the added line to get the lower level from the above/below
line.
Originally,
-1
was used for the added line, but I changed it to'='
in #26506 because it looked nicer on the markdown test case (the "doesn't open folds that are not touched" test), but it turns out this is quite bad. This PR reverts that change.