Move CursorMoved autocmd to main augroup

autoload/airline/extensions.vim

@@ -56,9 +56,7 @@ function! airline#extensions#apply_left_override(section1, section2)
   let w:airline_render_right = 0
 endfunction
 
-let s:active_winnr = -1
 function! airline#extensions#apply(...)
-  let s:active_winnr = winnr()
 
   if s:is_excluded_window()
     return -1
@@ -113,16 +111,8 @@ function! airline#extensions#load_theme()
   call airline#util#exec_funcrefs(s:ext._theme_funcrefs, g:airline#themes#{g:airline_theme}#palette)
 endfunction
 
-function! s:sync_active_winnr()
-  if exists('#airline') && winnr() != s:active_winnr
-    call airline#update_statusline()
-  endif
-endfunction
-
 function! airline#extensions#load()
   let loaded_ext = []
-  " non-trivial number of external plugins use eventignore=all, so we need to account for that
-  autocmd CursorMoved * call <sid>sync_active_winnr()
 
   if exists('g:airline_extensions')
     for ext in g:airline_extensions

plugin/airline.vim

@@ -35,15 +35,18 @@ function! s:init()
   silent doautocmd User AirlineAfterInit
 endfunction
 
+let s:active_winnr = -1
 function! s:on_window_changed()
+  let s:active_winnr = winnr()
+
   if pumvisible() && (!&previewwindow || g:airline_exclude_preview)
     return
   endif
   " Handle each window only once, since we might come here several times for
   " different autocommands.
-  let l:key = [bufnr('%'), winnr(), winnr('$'), tabpagenr(), &ft]
+  let l:key = [bufnr('%'), s:active_winnr, winnr('$'), tabpagenr(), &ft]
   if get(g:, 'airline_last_window_changed', []) == l:key
-        \ && &stl is# '%!airline#statusline('.winnr().')'
+        \ && &stl is# '%!airline#statusline('.s:active_winnr.')'
         \ && &ft !~? 'gitcommit'
     " fugitive is special, it changes names and filetypes several times,
     " make sure the caching does not get into its way
@@ -110,6 +113,11 @@ function! s:airline_toggle()
       if exists('##CompleteDone')
         autocmd CompleteDone * call <sid>on_window_changed()
       endif
+      " non-trivial number of external plugins use eventignore=all, so we need to account for that
+      autocmd CursorMoved *
+            \   if winnr() != s:active_winnr
+            \ |   call <sid>on_window_changed()
+            \ | endif
 
       autocmd VimResized * unlet! w:airline_lastmode | :call <sid>airline_refresh()
       autocmd TabEnter * :unlet! w:airline_lastmode | let w:airline_active=1