'main': Allow newlines in command position.

Fixes #501.

Fixes #616 (the original form; not the form in
test-data/alias-comment1.zsh which is now considered o be #677 (see
previous commit for details)).

Fixes a latent bug in test-data/always2.zsh.

No user-visible effect, and therefore, no changelog entry.

highlighters/main/main-highlighter.zsh

@@ -747,10 +747,12 @@ _zsh_highlight_main_highlighter_highlight_list()
          (*) style=unknown-token;;
        esac
      elif [[ $this_word == *':regular:'* ]]; then
-       # This highlights empty commands (semicolon follows nothing) as an error.
-       # Zsh accepts them, though.
+       style=commandseparator
+     elif [[ $this_word == *':start:'* ]] && [[ $arg == $'\n' ]]; then
        style=commandseparator
      else
+       # This highlights empty commands (semicolon follows nothing) as an error.
+       # Zsh accepts them, though.
        style=unknown-token
      fi
 

highlighters/main/test-data/always2.zsh

@@ -32,7 +32,7 @@ BUFFER=$'{\nls\n} always { pwd }'
 
 expected_region_highlight=(
   '1 1 reserved-word' # {
-  '2 2 unknown-token' # \n
+  '2 2 commandseparator' # \n
   '3 4 command' # ls
   '5 5 commandseparator' # \n
   '6 6 reserved-word' # }

highlighters/main/test-data/comment-followed.zsh

@@ -34,6 +34,6 @@ BUFFER=$'# foo\ntrue'
 
 expected_region_highlight=(
   '1 5 comment' # # foo
-  '6 6 commandseparator "issue #501"' # \n
+  '6 6 commandseparator' # \n
   '7 10 builtin' # true
 )

highlighters/main/test-data/empty-command-newline.zsh

@@ -34,6 +34,6 @@ BUFFER=$':;\n:'
 expected_region_highlight=(
   '1 1 builtin' # :
   '2 2 commandseparator' # ;
-  '3 3 commandseparator "issue #616"' # \n
+  '3 3 commandseparator' # \n
   '4 4 builtin' # :
 )