async Mode chopping off 1st Char on Write

[Nealium]

Issue description

Saving an edit sometimes chops of the first character in the showed ~7 lines rendered on the __CtrlSF__ Buffer

Things about your system and environment（请在此填写你的系统信息）

field	value
os	Windows 10 Pro 21H1
vim	Vim 8.2 Included patches: 1-12
backend	ag 2.2.5
locale	C.UTF-8

vimrc:

" CtrlSF
" let g:ctrlsf_debug_mode = 1
"   Maps -> Ctrl+F . Letter
nmap     <C-F>f <Plug>CtrlSFPrompt
vmap     <C-F>f <Plug>CtrlSFVwordPath
vmap     <C-F>F <Plug>CtrlSFVwordExec
nmap     <C-F>n <Plug>CtrlSFCwordPath
nmap     <C-F>p <Plug>CtrlSFPwordPath
nnoremap <C-F>o :CtrlSFOpen<CR>
nnoremap <C-F>t :CtrlSFToggle<CR>
inoremap <C-F>t <Esc>:CtrlSFToggle<CR>

"   Default Regex on
let g:ctrlsf_regex_pattern = 1
"   Don't be hangin
let g:ctrlsf_search_mode = 'async'

file:

• Any File, no consistency

[Nealium]

async specific.

Reason:

• __CtrlSF__'s Indent changes at some point during a very long search.
  • I was able to repeatably recreate this with a search that returned 300+ Files
    • specifically an Include Password in a PHP project
  • The point where it changed wasn't consistent, but it always changed
• This was due to ctrlsf#db#MaxLnum() changing due to a new match coming in with a larger Line Number
• The previously rendered Matches were not updated with the new indent, but on Write it took the MaxLine of the entire Buffer- hence, the root of the problem.

Solution:

• Give each Paragraph it's own Max Line Attribute and use that on NormalViewIncr + Unrender instead of the per-search

[Nealium]

I big downside of this solution is that if a page has multiple matches / paragraphs, they'll have different indents, which might look confusing.

Two potential solutions:

1. Set mlnum to a hard var, and update all paragraphs for a page when a new max is found
2. add mlnum to file object, and loop everything through files instead of a paragraphs
   • Max Line could be hard or just a page.para[-1].lines[-1].lnum
   • This would be a radical change to how it's rendered and unrendered