Fix #2263 - detailed Flow errors should show the original message

Author: w0rp

ale_linters/javascript/flow.vim

@@ -155,7 +155,8 @@ function! ale_linters#javascript#flow#Handle(buffer, lines) abort
         \}
 
         if has_key(l:error, 'extra')
-            let l:errorToAdd.detail = s:GetDetails(l:error)
+            let l:errorToAdd.detail = l:errorToAdd.text
+            \   . "\n" . s:GetDetails(l:error)
         endif
 
         call add(l:output, l:errorToAdd)

test/handler/test_flow_handler.vader

@@ -499,7 +499,8 @@ Execute(The flow handler should handle extra errors):
   \   'col': 35,
   \   'type': 'E',
   \   'text': 'props of React element `New`: This type is incompatible with object type',
-  \   'detail': 'Property `setVector` is incompatible: number  This type is incompatible with  function type ',
+  \   'detail': 'props of React element `New`: This type is incompatible with object type'
+  \     .  "\nProperty `setVector` is incompatible: number  This type is incompatible with  function type ",
   \ }
   \]