Change text without interrupting abbreviations

Question

I'd like to add a semicolon automatically in my current line. So I have this in my init.vim:

function Test()
    if matchstr(getline(line('.')), ';') != ';' && strlen(getline(line('.'))) > 4
        call setline(line('.'), substitute(getline(line('.')), '$', ';', 'e'))
        "execute 's/;\?$/;/e'
    endif
endfunction
autocmd TextChangedI <buffer> call Test()

To sum it up, what this function does:

1. Look, if there's already a semicolon (currently doesn't matter at which position it is)
2. Look if the current line has more than 4 characters
3. It both conditions are true, add a semicolon to the line

Now I have a problem with this function: It "breaks" my tabstops in coc and my abbrevations. Here's a demonstration:

ihu is my abbreviation for unsigned short (i stands for integer):

iab <buffer> ihu unsigned short

Now as you can see the abbreviation works in the beginning but after the placement of the semicolon my abbreviations don't work anymore.

You can also see in the function that I've tried to use

execute 's/;\?$/;/e'

but this produces the same problem.

Summarize

Do you have an idea how I can add the semicolon without breaking my abbreviations (and tabstops of some snippet-plugins)?

Edit

Ok, I found out that if it sets the semicolon earlier than after 4 characters, than I'll be able to use my abbreviations as usually. But I'd be happy if someone knows an answer to that question.

Answer 1

Ok, so it looks like that this problem doesn't occur anymore. I'd like to mark this question as "solved" or "finished" with this "answer".