#1006 Fix raw message handling for LSP support in NeoVim

autoload/ale/job.vim

@@ -25,6 +25,11 @@ endfunction
 
 " Note that jobs and IDs are the same thing on NeoVim.
 function! ale#job#JoinNeovimOutput(job, last_line, data, mode, callback) abort
+    if a:mode is# 'raw'
+        call a:callback(a:job, join(a:data, "\n"))
+        return ''
+    endif
+
     let l:lines = a:data[:-2]
 
     if len(a:data) > 1
@@ -34,15 +39,9 @@ function! ale#job#JoinNeovimOutput(job, last_line, data, mode, callback) abort
         let l:new_last_line = a:last_line . a:data[0]
     endif
 
-    if a:mode is# 'raw'
-        if !empty(l:lines)
-            call a:callback(a:job, join(l:lines, "\n") . "\n")
-        endif
-    else
-        for l:line in l:lines
-            call a:callback(a:job, l:line)
-        endfor
-    endif
+    for l:line in l:lines
+        call a:callback(a:job, l:line)
+    endfor
 
     return l:new_last_line
 endfunction

test/test_line_join.vader

@@ -62,8 +62,8 @@ Execute (ALE should pass on full lines for NeoVim for raw data):
 Execute (ALE should pass on a single long line):
   let g:last_line = ale#job#JoinNeovimOutput(1, '', ['x'], 'raw', function('RawCallback'))
 
-  AssertEqual '', g:data
-  AssertEqual 'x', g:last_line
+  AssertEqual 'x', g:data
+  AssertEqual '', g:last_line
 
 Execute (ALE should handle just a single line of output):
   let g:last_line = ale#job#JoinNeovimOutput(1, '', ['x', ''], 'raw', function('RawCallback'))
@@ -71,20 +71,8 @@ Execute (ALE should handle just a single line of output):
   AssertEqual "x\n", g:data
   AssertEqual '', g:last_line
 
-Execute (ALE should join two incomplete pieces of large lines together):
-  let g:last_line = ale#job#JoinNeovimOutput(1, 'x', ['y'], 'raw', function('RawCallback'))
+Execute (ALE should pass on two lines and one incomplete one):
+  let g:last_line = ale#job#JoinNeovimOutput(1, '', ['y', 'z', 'a'], 'raw', function('RawCallback'))
 
-  AssertEqual '', g:data
-  AssertEqual 'xy', g:last_line
-
-Execute (ALE join incomplete lines, and set new ones):
-  let g:last_line = ale#job#JoinNeovimOutput(1, 'x', ['y', 'z', 'a'], 'raw', function('RawCallback'))
-
-  AssertEqual "xy\nz\n", g:data
-  AssertEqual 'a', g:last_line
-
-Execute (ALE join incomplete lines, and set new ones, with two elements):
-  let g:last_line = ale#job#JoinNeovimOutput(1, 'x', ['y', 'z'], 'raw', function('RawCallback'))
-
-  AssertEqual "xy\n", g:data
-  AssertEqual 'z', g:last_line
+  AssertEqual "y\nz\na", g:data
+  AssertEqual '', g:last_line