feat: add inverse search cursor blink

refer: #3039

Author: lervag

autoload/vimtex/options.vim

@@ -628,6 +628,7 @@ function! s:init_highlights() abort " {{{1
         \ ['VimtexWarning', 'WarningMsg'],
         \ ['VimtexError', 'Error'],
         \ ['VimtexFatal', 'ErrorMsg'],
+        \ ['VimtexBlink', 'PMenu'],
         \ ['VimtexTocHelp', 'helpVim'],
         \ ['VimtexTocHelpKey', 'ModeMsg'],
         \ ['VimtexTocHelpLayerOn', 'Statement'],

autoload/vimtex/ui.vim

@@ -166,6 +166,21 @@ function! vimtex#ui#get_winwidth() abort
   return winwidth(0) - l:numwidth - l:foldwidth - l:signwidth
 endfunction
 
+function! vimtex#ui#blink() abort
+  call sign_define('vimtexblink', #{ linehl: 'VimtexBlink' })
+
+  for i in range(1, 4)
+    call sign_place(1, 'vimtex', 'vimtexblink', '', #{ lnum: '.' })
+    redraw
+    sleep 150m
+    call sign_unplace('vimtex')
+    redraw
+    sleep 150m
+  endfor
+
+  call sign_undefine("vimtexblink")
+endfunction
+
 
 function! s:echo_string(msg, opts) abort
   echohl VimtexMsg

autoload/vimtex/view.vim

@@ -118,6 +118,8 @@ function! vimtex#view#inverse_search(line, filename, column = 0) abort
   endif
   redraw
 
+  call vimtex#ui#blink()
+
   if exists('#User#VimtexEventViewReverse')
     doautocmd <nomodeline> User VimtexEventViewReverse
   endif