make Scroll into view optional

src/General/Config.coffee

@@ -427,6 +427,10 @@ Config =
       false
       ''
     ]
+    'Scroll into view': [
+      true
+      'Scroll down when expanding images to bring the full image into view.'
+    ]
     'Expand spoilers': [
       true
       'Expand all images along with spoilers.'

src/Images/ImageExpand.coffee

@@ -84,7 +84,7 @@ ImageExpand =
 
   toggle: (post) ->
     unless post.file.isExpanding or post.file.isExpanded
-      post.file.scrollIntoView = true
+      post.file.scrollIntoView = Conf['Scroll into view']
       ImageExpand.expand post
       return