Adding the g:ycm_open_loclist_on_ycm_diags option

README.md

@@ -555,6 +555,10 @@ You may want to map this command to a key; try putting `nnoremap <F5>
 Calling this command will fill Vim's `locationlist` with errors or warnings if
 any were detected in your file and then open it.
 
+The `g:ycm_open_loclist_on_ycm_diags` option can be used to prevent the location
+list from opening, but still have it filled with new diagnostic data. See the
+_Options_ section for details.
+
 ### The `:YcmShowDetailedDiagnostic` command
 
 This command shows the full diagnostic text when the user's cursor is on the
@@ -890,6 +894,17 @@ Default: `0`
 
     let g:ycm_always_populate_location_list = 0
 
+### The `g:ycm_open_loclist_on_ycm_diags` option
+
+When this option is set, `:YcmDiags` will automatically open the location list
+after forcing a compilation and filling the list with diagnostic data.
+
+See `:help location-list` in Vim to learn more about the location list.
+
+Default: `1`
+
+    let g:ycm_open_loclist_on_ycm_diags = 1
+
 ### The `g:ycm_allow_changing_updatetime` option
 
 When this option is set to `1`, YCM will change the `updatetime` Vim option to

autoload/youcompleteme.vim

@@ -787,7 +787,10 @@ function! s:ShowDiagnostics()
         \ 'ycm_state.GetDiagnosticsFromStoredRequest( qflist_format = True )' )
   if !empty( diags )
     call setloclist( 0, diags )
-    lopen
+
+    if g:ycm_open_loclist_on_ycm_diags
+      lopen
+    endif
   else
     echom "No warnings or errors detected"
   endif

plugin/youcompleteme.vim

@@ -74,6 +74,9 @@ let g:loaded_youcompleteme = 1
 let g:ycm_allow_changing_updatetime =
       \ get( g:, 'ycm_allow_changing_updatetime', 1 )
 
+let g:ycm_open_loclist_on_ycm_diags =
+      \ get( g:, 'ycm_open_loclist_on_ycm_diags', 1 )
+
 let g:ycm_add_preview_to_completeopt =
       \ get( g:, 'ycm_add_preview_to_completeopt', 0 )