#653 - Automatically accept annoying loclist and quickfix errors from Vim

autoload/ale/completion.vim

@@ -1,10 +1,6 @@
 " Author: w0rp <devw0rp@gmail.com>
 " Description: Completion support for LSP linters
 
-" A do-nothing function so we can load this autoload file in tests.
-function! ale#completion#Nop() abort
-endfunction
-
 let s:timer_id = -1
 
 function! s:GetRegex(map, filetype) abort
@@ -110,11 +106,6 @@ function! ale#completion#OmniFunc(findstart, base) abort
     endif
 endfunction
 
-" A wrapper function for feedkeys so we can test calls for it.
-function! ale#completion#FeedKeys(string, mode) abort
-    call feedkeys(a:string, a:mode)
-endfunction
-
 function! ale#completion#Show(response, completion_parser) abort
     " Remember the old omnifunc value, if there is one.
     " If we don't store an old one, we'll just never reset the option.
@@ -129,7 +120,7 @@ function! ale#completion#Show(response, completion_parser) abort
     let b:ale_completion_parser = a:completion_parser
     let &l:omnifunc = 'ale#completion#OmniFunc'
     call s:ReplaceCompleteopt()
-    call ale#completion#FeedKeys("\<C-x>\<C-o>", 'n')
+    call ale#util#FeedKeys("\<C-x>\<C-o>", 'n')
 endfunction
 
 function! s:CompletionStillValid(request_id) abort

autoload/ale/events.vim

@@ -45,3 +45,25 @@ function! ale#events#FileChangedEvent(buffer) abort
         call s:LintOnEnter(a:buffer)
     endif
 endfunction
+
+" When changing quickfix or a loclist window while the window is open
+" from autocmd events and while navigating from one buffer to another, Vim
+" will complain saying that the window has closed or that the lists have
+" changed.
+"
+" This timer callback just accepts those errors when they appear.
+function! s:HitReturn(...) abort
+    if ale#util#Mode() is# 'r'
+        redir => l:output
+            silent mess
+        redir end
+
+        if get(split(l:output, "\n"), -1, '') =~# '^E92[456]'
+            call ale#util#FeedKeys("\<CR>", 'n')
+        endif
+    endif
+endfunction
+
+function! ale#events#BufWinLeave() abort
+    call timer_start(0, function('s:HitReturn'))
+endfunction

autoload/ale/util.vim

@@ -1,11 +1,23 @@
 " Author: w0rp <devw0rp@gmail.com>
 " Description: Contains miscellaneous functions
 
-" A null file for sending output to nothing.
-let g:ale#util#nul_file = '/dev/null'
+" A wrapper function for mode() so we can test calls for it.
+function! ale#util#Mode(...) abort
+    return call('mode', a:000)
+endfunction
 
-if has('win32')
-    let g:ale#util#nul_file = 'nul'
+" A wrapper function for feedkeys so we can test calls for it.
+function! ale#util#FeedKeys(...) abort
+    return call('feedkeys', a:000)
+endfunction
+
+if !exists('g:ale#util#nul_file')
+    " A null file for sending output to nothing.
+    let g:ale#util#nul_file = '/dev/null'
+
+    if has('win32')
+        let g:ale#util#nul_file = 'nul'
+    endif
 endif
 
 " Return the number of lines for a given buffer.