On autoformat `let g:dhall_format=1` undo takes a dozens of history to revert one change

[ivankovnatsky]

When using let g:dhall_format=1 and trying to undo a buffer to a previous state it takes lots of u pressing to make that happen.

Hard to tell but it seems like on write dhall makes not one change but lots.

Though I'm using neovim:

nvim --version
NVIM v0.6.0
Build type: Release
LuaJIT 2.1.0-beta3