'main': Do not look for metacharacters in parameter expansions.

Fixes the bug the previous commit added a test for.

Author: danielshahaf

highlighters/main/main-highlighter.zsh

@@ -860,11 +860,14 @@ _zsh_highlight_main_highlighter_highlight_list()
                             fi
                           fi
                           continue
-                        elif [[ $arg[0,1] = $histchars[0,1] ]] && (( $#arg[0,2] == 2 )); then
+                        elif (( ! in_param )) &&
+                             [[ $arg[0,1] = $histchars[0,1] ]] && (( $#arg[0,2] == 2 )); then
                           style=history-expansion
-                        elif [[ $arg[0,1] == $histchars[2,2] ]]; then
+                        elif (( ! in_param )) &&
+                             [[ $arg[0,1] == $histchars[2,2] ]]; then
                           style=history-expansion
-                        elif [[ $arg[1,2] == '((' ]]; then
+                        elif (( ! in_param )) &&
+                             [[ $arg[1,2] == '((' ]]; then
                           # Arithmetic evaluation.
                           #
                           # Note: prior to zsh-5.1.1-52-g4bed2cf (workers/36669), the ${(z)...}
@@ -879,14 +882,17 @@ _zsh_highlight_main_highlighter_highlight_list()
                             _zsh_highlight_main_add_region_highlight $((end_pos - 2)) $end_pos reserved-word
                           fi
                           continue
-                        elif [[ $arg == '()' ]]; then
+                        elif (( ! in_param )) &&
+                             [[ $arg == '()' ]]; then
                           # anonymous function
                           style=reserved-word
-                        elif [[ $arg == $'\x28' ]]; then
+                        elif (( ! in_param )) &&
+                             [[ $arg == $'\x28' ]]; then
                           # subshell
                           style=reserved-word
                           braces_stack='R'"$braces_stack"
-                        elif [[ $arg == $'\x29' ]]; then
+                        elif (( ! in_param )) &&
+                             [[ $arg == $'\x29' ]]; then
                           # end of subshell or command substitution
                           if _zsh_highlight_main__stack_pop 'S'; then
                             REPLY=$start_pos

highlighters/main/test-data/parameter-expansion-untokenized1.zsh

@@ -33,6 +33,6 @@ local x="()"
 BUFFER=$'$x ls'
 
 expected_region_highlight=(
-  '1 2 unknown-token "fixed in the next commit"' # $x
+  '1 2 unknown-token' # $x
   '4 5 command' # ls
 )

highlighters/main/test-data/parameter-expansion-untokenized2.zsh

@@ -33,6 +33,6 @@ local x="^foo^bar"
 BUFFER=$'$x ls'
 
 expected_region_highlight=(
-  '1 2 unknown-token "fixed in the next commit"' # $x
+  '1 2 unknown-token' # $x
   '4 5 default' # ls
 )