[vim/vim] leading whitespaces are not cleared with autocomplete, expandtab and `o<esc>` (Issue #18560)

[Maxim Kim]

habamax created an issue (vim/vim#18560)

Steps to reproduce

1. vim --clean +"set expandtab ac complete+=o list listchars=space:." test.vim
2. type def Hello()
3. press o<ESC>

Expected behaviour

Leading spaces should be removed.

https://asciinema.org/a/4OIJmPfuhqbhqxLUbpkz7YN9f

ping @girishji

Note, this is not happening without expandtab or if you press Enter after def Hello().

Version of Vim

9.1.1852

Environment

debian13, bash

Logs and stack traces

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[Maxim Kim]

habamax left a comment (vim/vim#18560)

I don't get popupmenu if there is no indent:

https://asciinema.org/a/tH8vuodhB7nNEaaReXHmXmmfl

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[Maxim Kim]

habamax left a comment (vim/vim#18560)

I have updated vim's omnicomplete to not start completion on empty prefix: #18561

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[Maxim Kim]

habamax left a comment (vim/vim#18560)

Simplified min repro steps:

1. vim --clean +"set et ai ac"
2. i<tab>hello<esc>o<esc>

https://asciinema.org/a/lrthxJacliRBFB4eWxIc8xbc3

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