Problem:
After expanding tabs with the `expandtab` option, if the old indent
matches the requested one, `vim.text.indent()` returns the input
unchanged.
The optimization path assumes that if old_indent == size, the input
wouldn't be changed, which is not correct when old_indent is formed by
expanded tabs.
Solution:
Apply the optimization only when `expandtab` is not set.
Problem:
The "gitsigns" plugin runs `vim.diff` in a thread (`uv.new_work`), but
`vim.diff` is nil in that context:
Lua callback:
…/gitsigns.nvim/lua/gitsigns/diff_int.lua:30: bad argument #1 to 'decode' (string expected, got nil)
stack traceback:
[C]: in function 'decode'
…/gitsigns.nvim/lua/gitsigns/diff_int.lua:30: in function <…/gitsigns.nvim/lua/gitsigns/diff_int.lua:29>
Luv thread:
…/gitsigns.nvim/lua/gitsigns/diff_int.lua:63: attempt to call field 'diff' (a nil value)
Solution:
Revert the `stdlib.c` change (set `vim.diff` instead of `vim._diff`).
Problem:
Indenting text is a common task in plugins/scripts for
presentation/formatting, yet vim has no way of doing it (especially
"dedent", and especially non-buffer text).
Solution:
Introduce `vim.text.indent()`. It sets the *exact* indentation because
that's a more difficult (and thus more useful) task than merely
"increasing the current indent" (which is somewhat easy with a `gsub()`
one-liner).
Lua's string.byte has a maximum (undocumented) allowable length, so
vim.text.hencode fails on large strings with the error "string slice too
long".
Instead of converting the string to an array of bytes up front, convert
each character to a byte one at a time.
