Revert "Remove 'Restart when Opened' option. #904"

This reverts commit 8ab49a22146e6e476fd29ca7b8df65d1aab766d8.

src/Images/ImageCommon.coffee

@@ -6,6 +6,12 @@ ImageCommon =
     $.off video, 'volumechange', Volume.change
     video.muted = true
 
+  rewind: (el) ->
+    if el.nodeName is 'VIDEO'
+      el.currentTime = 0 if el.readyState >= el.HAVE_METADATA
+    else if /\.gif$/.test el.src
+      $.queueTask -> el.src = el.src
+
   pushCache: (el) ->
     ImageCommon.cache = el
     $.on el, 'error', ImageCommon.cacheError

src/Images/ImageExpand.coffee

@@ -146,6 +146,7 @@ ImageExpand =
       ImageCommon.pause el
       for eventName, cb of ImageExpand.videoCB
         $.off el, eventName, cb
+    ImageCommon.rewind file.thumb if Conf['Restart when Opened']
     delete file.fullImage
     $.queueTask ->
       # XXX Work around Chrome/Chromium not firing mouseover on the thumbnail.
@@ -168,6 +169,7 @@ ImageExpand =
     else if ImageCommon.cache?.dataset.fullID is post.fullID
       el = file.fullImage = ImageCommon.popCache()
       $.on el, 'error', ImageExpand.error
+      ImageCommon.rewind el if Conf['Restart when Opened'] and el.id isnt 'ihover'
       el.removeAttribute 'id'
     else
       el = file.fullImage = $.el (if isVideo then 'video' else 'img')

src/Images/ImageHover.coffee

@@ -34,6 +34,9 @@ ImageHover =
       $.on el, 'error', error
       el.src = file.url
 
+    if Conf['Restart when Opened']
+      ImageCommon.rewind el
+      ImageCommon.rewind @
     el.id = 'ihover'
     $.add Header.hover, el
     if isVideo

src/config/Config.coffee

@@ -254,6 +254,10 @@ Config =
         true
         'Videos begin playing immediately when opened.'
       ]
+      'Restart when Opened': [
+        false
+        'Restart GIFs and WebMs when you hover over or expand them.'
+      ]
       'Show Controls': [
         true
         'Show controls on videos expanded inline.'