Actually fix suggestions when `sh_split_words` option is enabled.

src/suggestion.zsh

@@ -8,12 +8,7 @@ _zsh_autosuggest_suggestion() {
 	setopt localoptions extendedglob
 
 	# Escape the prefix (requires EXTENDED_GLOB)
-	local prefix=${1//(#m)[\][()|\\*?#<>~^]/\\$MATCH}
+	local prefix="${1//(#m)[\][()|\\*?#<>~^]/\\$MATCH}"
 
-	# Get all history items (reversed) that match pattern $prefix*
-	local history_matches
-	history_matches=(${history[(R)$prefix*]})
-
-	# Echo the first item that matches
-	echo ${history_matches[1]}
+	fc -ln -m "$prefix*" 2>/dev/null | tail -1
 }

zsh-autosuggestions.zsh

@@ -291,14 +291,9 @@ _zsh_autosuggest_suggestion() {
 	setopt localoptions extendedglob
 
 	# Escape the prefix (requires EXTENDED_GLOB)
-	local prefix=${1//(#m)[\][()|\\*?#<>~^]/\\$MATCH}
+	local prefix="${1//(#m)[\][()|\\*?#<>~^]/\\$MATCH}"
 
-	# Get all history items (reversed) that match pattern $prefix*
-	local history_matches
-	history_matches=(${history[(R)$prefix*]})
-
-	# Echo the first item that matches
-	echo ${history_matches[1]}
+	fc -ln -m "$prefix*" 2>/dev/null | tail -1
 }
 
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