Revert `fc` usage in calculating suggestion

As far as I know, `fc` makes it impossible to tell whether history items
used an actual newline character or the string "\n". Pulling from the
`$history` array gives a more accurate representation of the actual
command that was run.

spec/strategies/default_spec.rb

@@ -30,7 +30,7 @@ describe 'default strategy' do
     end
   end
 
-  xcontext 'with a multiline hist entry' do
+  context 'with a multiline hist entry' do
     before do
       session.send_string('echo "')
       session.send_keys('enter')

src/strategies/default.zsh

@@ -9,5 +9,12 @@
 _zsh_autosuggest_strategy_default() {
 	setopt localoptions EXTENDED_GLOB
 
-	fc -lnrm "${1//(#m)[\\()\[\]|*?~]/\\$MATCH}*" 1 2>/dev/null | head -n 1
+	local prefix="${1//(#m)[\\()\[\]|*?~]/\\$MATCH}"
+
+	# Get the keys of the history items that match
+	local -a histkeys
+	histkeys=(${(k)history[(r)$prefix*]})
+
+	# Echo the value of the first key
+	echo -E "${history[$histkeys[1]]}"
 }

zsh-autosuggestions.zsh

@@ -421,7 +421,14 @@ zle -N _autosuggest-show-suggestion _zsh_autosuggest_show_suggestion
 _zsh_autosuggest_strategy_default() {
 	setopt localoptions EXTENDED_GLOB
 
-	fc -lnrm "${1//(#m)[\\()\[\]|*?~]/\\$MATCH}*" 1 2>/dev/null | head -n 1
+	local prefix="${1//(#m)[\\()\[\]|*?~]/\\$MATCH}"
+
+	# Get the keys of the history items that match
+	local -a histkeys
+	histkeys=(${(k)history[(r)$prefix*]})
+
+	# Echo the value of the first key
+	echo -E "${history[$histkeys[1]]}"
 }
 
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