Revert usage of fc for suggestions and fix for sh_word_split.

Force field splitting on \0 to support sh_word_split option.

zsh-autosuggestions.zsh

@@ -293,7 +293,12 @@ _zsh_autosuggest_suggestion() {
 	# Escape the prefix (requires EXTENDED_GLOB)
 	local prefix="${1//(#m)[\][()|\\*?#<>~^]/\\$MATCH}"
 
-	fc -ln -m "$prefix*" 2>/dev/null | tail -1
+	# Get all history items (reversed) that match pattern $prefix*
+	local history_matches
+	history_matches=(${(j:\0:s:\0:)history[(R)$prefix*]})
+
+	# Echo the first item that matches
+	echo "$history_matches[1]"
 }
 
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