* fix: don't blow up when `nvim_buf_get_lines()` returns Blobs
Some LSP servers may return binary garbage and `nvim_buf_get_lines()`
will return a `Blob` instead of a `String` in those cases.
I added some `print(vim.inspect())` debugging in
`entry.get_documentation()` to prove that by the time the text passes
through there, it's already garbage.
Here's an excerpt from a sample line returned by `nvim_buf_get_lines()`,
as rendered by `vim.inspect()`:
default\0\0\0! vim.opt.background = 'dark'\0\0\0000
(etc)
Now, this looks like an LSP bug to me, but I think we shouldn't allow
buggy LSP output to crash nvim-cmp. "Be conservative in what you send,
be liberal in what you accept" and all that.
So, degrade by coercing any `Blob` we see into a `String` before passing
it to `strdisplaywidth()`.
Closes: https://github.com/hrsh7th/nvim-cmp/issues/820
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Co-authored-by: hrsh7th <629908+hrsh7th@users.noreply.github.com>
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