feat!(position): optimize max_len align & add fixed_col align

[utkarshgupta137]

I've changed the max_len_align/padding to a new key position so that the user can choose one of 3 options instead of having 2 bools. It should also simplify adding more alignment modes in the future (such as "right" from rust-tools.nvim).
I've also changed the code to use the virt_text_win_col, so that we don't have to calculate the padding for each line.

[utkarshgupta137]

@lvimuser Have you had a chance to look at this? I've been using this for over a month now. There is only minor 1 issue with this which is that if I enter text after my selected column, then the virtual text will hide the text that I've entered. Is there a setting I'm not seeing which will allow the virt_text to be hidden behind actual text instead? Fiddling with priority didn't help.

[lvimuser]

I haven't, no. You may look into the left_gravity option or perhaps avoid virt_text_win_col.

[manish-baghel]

@utkarshgupta137
virt_text_pos might be a better alternative to virt_text_win_col.

Having said that, you can avoid the issue by getting the current line length and setting the virt_text_win_col to

-- inside the loop
-- probably not the best way to get line length
line_len = string.len(vim.api.nvim.get_cur_line())
virt_text_win_col = math.max(opts.position.padding, line_len + 1)