Need to reset the POSTDISPLAY if exiting early

Specific case where this matters is following:

Be in vi insert mode with some text in the buffer and the cursor at the
end of the buffer. Press `esc` to trigger `vi-cmd-mode widget`, then
before the cursor moves (KEYTIMEOUT), press `h` to trigger
`vi-backward-char` widget. When `vi-cmd-mode` original widget exits,
KEYS_QUEUED_COUNT will be non-zero and the suggestion will be lost.

spec/integrations/vi_mode_spec.rb

@@ -0,0 +1,21 @@
+describe 'when using vi mode' do
+  let(:before_sourcing) do
+    -> do
+      session.run_command('bindkey -v')
+    end
+  end
+
+  describe 'moving the cursor after exiting insert mode' do
+    it 'should not clear the current suggestion' do
+      with_history('foobar foo') do
+        session.
+          send_string('foo').
+          send_keys('escape').
+          send_keys('h')
+
+        wait_for { session.content }.to eq('foobar foo')
+      end
+    end
+  end
+end
+

src/widgets.zsh

@@ -55,6 +55,7 @@ _zsh_autosuggest_modify() {
 
 	# Don't fetch a new suggestion if there's more input to be read immediately
 	if (( $PENDING > 0 )) || (( $KEYS_QUEUED_COUNT > 0 )); then
+		POSTDISPLAY="$orig_postdisplay"
 		return $retval
 	fi
 

zsh-autosuggestions.zsh

@@ -333,6 +333,7 @@ _zsh_autosuggest_modify() {
 
 	# Don't fetch a new suggestion if there's more input to be read immediately
 	if (( $PENDING > 0 )) || (( $KEYS_QUEUED_COUNT > 0 )); then
+		POSTDISPLAY="$orig_postdisplay"
 		return $retval
 	fi