What other than mappings and abbreviations can change the text I'm typing?

Question

The question

When editing TeX files (to do so, I use vimtex) if I've discovered that if I write lll in insert mode, I get \ell.

How do I find why this is happening?

My research

I thought "ok, I'll find out where this mapping or abbreviation is and whther vimtex or something else creates it".

I've checked :ab lll and all :*map lll, and the culprit turns out to be lmap, as the output of :verbose lmap lll is the following:

Kitty keyboard protocol: Cleared
l  l           * L
        Last set from ~/.vimrc line 654

And that line is where the following function is defined,

for c in range(char2nr('A'), char2nr('Z'))
    exe 'lnoremap ' . nr2char(c+32) . ' ' . nr2char(c)
    exe 'lnoremap ' . nr2char(c) . ' ' . nr2char(c+32)
endfor

which I took from here eons ago (and which comes with autocmd InsertLeave * set iminsert=0 too).

But how is that causing the behavior I described above? And why only when filetype is tex???

Well the answer is that it is not, because if I delete that stuff the issue persists. After all, the output of :verbose lmap lll is not really telling me that lll is mapped to anything. Just that l is, and that's ok. Indeed, deleting the for loop above, :verbose lmap lll too gives no result.

So I'm left with :ab lll and all of :*map lll giving no output.

Where does this behavior come from?

Answer 1

I had forgotten about this. However, yes, it's vim-snippets's UltiSnips snippet for TeX.

snippet lll "l" Aw
\ell
endsnippet

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Eventually, I pushed a fix.