Merge upstream (#111)

app/javascript/mastodon/is_mobile.js

@@ -12,6 +12,15 @@ export function isMobile(width, columns) {
 };
 
 const iOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
+let userTouching = false;
+
+window.addEventListener('touchstart', () => {
+  userTouching = true;
+}, { once: true });
+
+export function isUserTouching() {
+  return userTouching;
+}
 
 export function isIOS() {
   return iOS;