Stop requiring function_argzero

This commit is based on [zsh-syntax-highlighting's similar commit][1].

Also, motivated from PR #640.

[1]: https://github.com/zsh-users/zsh-syntax-highlighting/commit/750aebc553f2f4149055ef4cb9d7641f5df6d3ea

src/async.zsh

@@ -44,6 +44,7 @@ _zsh_autosuggest_async_request() {
 
 	# There's a weird bug here where ^C stops working unless we force a fork
 	# See https://github.com/zsh-users/zsh-autosuggestions/issues/364
+	autoload -Uz is-at-least
 	is-at-least 5.8 || command true
 
 	# Read the pid from the child process
@@ -64,7 +65,7 @@ _zsh_autosuggest_async_response() {
 	if [[ -z "$2" || "$2" == "hup" ]]; then
 		# Read everything from the fd and give it as a suggestion
 		IFS='' read -rd '' -u $1 suggestion
-		_zsh_autosuggest_async_suggest "$suggestion"
+		zle autosuggest-suggest -- "$suggestion"
 
 		# Close the fd
 		exec {1}<&-
@@ -73,14 +74,3 @@ _zsh_autosuggest_async_response() {
 	# Always remove the handler
 	zle -F "$1"
 }
-
-_zsh_autosuggest_async_suggest() {
-	# Before 5.9, async suggestions break widgets that rely on LASTWIDGET
-	# such as copy-earlier-word and {up,down}-line-or-beginning-search. In
-	# 5.9, a flag was added to `zle` that will skip setting LASTWIDGET so
-	# that those widgets that depend on it will continue to work
-	# See https://www.zsh.org/mla/workers/2020/msg00824.html
-	local nolast
-	is-at-least 5.9 && nolast=supported
-	zle autosuggest-suggest ${=nolast:+-f nolast} -- "$1"
-}

src/config.zsh

@@ -28,6 +28,8 @@ typeset -g ZSH_AUTOSUGGEST_ORIGINAL_WIDGET_PREFIX=autosuggest-orig-
 		history-search-backward
 		history-beginning-search-forward
 		history-beginning-search-backward
+		history-beginning-search-forward-end
+		history-beginning-search-backward-end
 		history-substring-search-up
 		history-substring-search-down
 		up-line-or-beginning-search

zsh-autosuggestions.plugin.zsh

@@ -1 +1,2 @@
+0=${(%):-%N}
 source ${0:A:h}/zsh-autosuggestions.zsh

zsh-autosuggestions.zsh

@@ -54,6 +54,8 @@ typeset -g ZSH_AUTOSUGGEST_ORIGINAL_WIDGET_PREFIX=autosuggest-orig-
 		history-search-backward
 		history-beginning-search-forward
 		history-beginning-search-backward
+		history-beginning-search-forward-end
+		history-beginning-search-backward-end
 		history-substring-search-up
 		history-substring-search-down
 		up-line-or-beginning-search
@@ -799,6 +801,7 @@ _zsh_autosuggest_async_request() {
 
 	# There's a weird bug here where ^C stops working unless we force a fork
 	# See https://github.com/zsh-users/zsh-autosuggestions/issues/364
+	autoload -Uz is-at-least
 	is-at-least 5.8 || command true
 
 	# Read the pid from the child process
@@ -819,7 +822,7 @@ _zsh_autosuggest_async_response() {
 	if [[ -z "$2" || "$2" == "hup" ]]; then
 		# Read everything from the fd and give it as a suggestion
 		IFS='' read -rd '' -u $1 suggestion
-		_zsh_autosuggest_async_suggest "$suggestion"
+		zle autosuggest-suggest -- "$suggestion"
 
 		# Close the fd
 		exec {1}<&-
@@ -829,17 +832,6 @@ _zsh_autosuggest_async_response() {
 	zle -F "$1"
 }
 
-_zsh_autosuggest_async_suggest() {
-	# Before 5.9, async suggestions break widgets that rely on LASTWIDGET
-	# such as copy-earlier-word and {up,down}-line-or-beginning-search. In
-	# 5.9, a flag was added to `zle` that will skip setting LASTWIDGET so
-	# that those widgets that depend on it will continue to work
-	# See https://www.zsh.org/mla/workers/2020/msg00824.html
-	local nolast
-	is-at-least 5.9 && nolast=supported
-	zle autosuggest-suggest ${=nolast:+-f nolast} -- "$1"
-}
-
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