Ensure we always destroy the zpty

If running in sync mode and a completion takes a long time, the user can
^C out of it. Without this patch, the pty will not be destroyed in this
case and the next time we go to create it, it will fail, making the
shell unusable.

src/strategies/completion.zsh

@@ -86,6 +86,7 @@ _zsh_autosuggest_strategy_completion() {
 		zpty -w $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME $'\t'
 	fi
 
+	{
 		# The completion result is surrounded by null bytes, so read the
 		# content between the first two null bytes.
 		zpty -r $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME line '*'$'\0''*'$'\0'
@@ -93,7 +94,8 @@ _zsh_autosuggest_strategy_completion() {
 		# On older versions of zsh, we sometimes get extra bytes after the
 		# second null byte, so trim those off the end
 		suggestion="${${${(M)line:#*$'\0'*$'\0'*}#*$'\0'}%%$'\0'*}"
-
+	} always {
 		# Destroy the pty
 		zpty -d $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME
 	}
+}

zsh-autosuggestions.zsh

@@ -556,6 +556,7 @@ _zsh_autosuggest_strategy_completion() {
 		zpty -w $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME $'\t'
 	fi
 
+	{
 		# The completion result is surrounded by null bytes, so read the
 		# content between the first two null bytes.
 		zpty -r $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME line '*'$'\0''*'$'\0'
@@ -563,10 +564,11 @@ _zsh_autosuggest_strategy_completion() {
 		# On older versions of zsh, we sometimes get extra bytes after the
 		# second null byte, so trim those off the end
 		suggestion="${${${(M)line:#*$'\0'*$'\0'*}#*$'\0'}%%$'\0'*}"
-
+	} always {
 		# Destroy the pty
 		zpty -d $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME
 	}
+}
 
 #--------------------------------------------------------------------#
 # History Suggestion Strategy                                        #