Revert "better fix for not scrolling textarea"

Focusing an offscreen textarea might be bad for usability.

app/assets/javascripts/related_tag.js

@@ -226,7 +226,9 @@
       Danbooru.RelatedTag.process_artist(Danbooru.RelatedTag.recent_artist);
     }
 
-    $field.focusWithoutScroll();
+    if ($(window).scrollTop() <= $field.offset().top) {
+      $field.focus();
+    }
 
     e.preventDefault();
   }

app/assets/javascripts/utility.js

@@ -103,11 +103,4 @@
     this.selectRange(this.val().length, this.val().length);
     return this;
   }
-
-  $.fn.focusWithoutScroll = function(){
-    var x = window.scrollX;
-    var y = window.scrollY;
-    this.focus();
-    window.scrollTo(x, y);
-  };
 })();