Fix #2535 - Automatically emit <C-x><C-o> less to prevent <C-o> issues

autoload/ale/completion.vim

@@ -216,18 +216,6 @@ function! ale#completion#GetCompletionPosition() abort
 endfunction
 
 function! ale#completion#GetCompletionResult() abort
-    " Parse a new response if there is one.
-    if exists('b:ale_completion_response')
-    \&& exists('b:ale_completion_parser')
-        let l:response = b:ale_completion_response
-        let l:parser = b:ale_completion_parser
-
-        unlet b:ale_completion_response
-        unlet b:ale_completion_parser
-
-        let b:ale_completion_result = function(l:parser)(l:response)
-    endif
-
     if exists('b:ale_completion_result')
         return b:ale_completion_result
     endif
@@ -247,15 +235,20 @@ function! ale#completion#AutomaticOmniFunc(findstart, base) abort
     endif
 endfunction
 
-function! ale#completion#Show(response, completion_parser) abort
+function! ale#completion#Show(result) abort
     if ale#util#Mode() isnot# 'i'
         return
     endif
 
     " Set the list in the buffer, temporarily replace omnifunc with our
     " function, and then start omni-completion.
-    let b:ale_completion_response = a:response
-    let b:ale_completion_parser = a:completion_parser
+    let b:ale_completion_result = a:result
+
+    " Don't try to open the completion menu if there's nothing to show.
+    if empty(b:ale_completion_result)
+        return
+    endif
+
     " Replace completion options shortly before opening the menu.
     call s:ReplaceCompletionOptions()
 
@@ -475,8 +468,7 @@ function! ale#completion#HandleTSServerResponse(conn_id, response) abort
         endif
     elseif l:command is# 'completionEntryDetails'
         call ale#completion#Show(
-        \   a:response,
-        \   'ale#completion#ParseTSServerCompletionEntryDetails',
+        \   ale#completion#ParseTSServerCompletionEntryDetails(a:response),
         \)
     endif
 endfunction
@@ -488,8 +480,7 @@ function! ale#completion#HandleLSPResponse(conn_id, response) abort
     endif
 
     call ale#completion#Show(
-    \   a:response,
-    \   'ale#completion#ParseLSPCompletions',
+    \   ale#completion#ParseLSPCompletions(a:response),
     \)
 endfunction
 
@@ -585,8 +576,6 @@ function! ale#completion#GetCompletions(source) abort
     \   'request_id': 0,
     \   'source': a:source,
     \}
-    unlet! b:ale_completion_response
-    unlet! b:ale_completion_parser
     unlet! b:ale_completion_result
 
     let l:buffer = bufnr('')