Remove topMargin since the header is no longer pinned

Change-Id: I8a39995f0e1ec20c2cbbb869091744e92af45d0f

polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.html

@@ -181,9 +181,7 @@ limitations under the License.
     </template>
     <gr-rest-api-interface id="restAPI"></gr-rest-api-interface>
     <gr-storage id="storage"></gr-storage>
-    <gr-diff-cursor
-        id="cursor"
-        fold-offset-top="[[topMargin]]"></gr-diff-cursor>
+    <gr-diff-cursor id="cursor"></gr-diff-cursor>
   </template>
   <script src="gr-file-list.js"></script>
 </dom-module>

polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.js

@@ -27,7 +27,6 @@
       drafts: Object,
       revisions: Object,
       projectConfig: Object,
-      topMargin: Number,
       selectedIndex: {
         type: Number,
         notify: true,
@@ -352,7 +351,7 @@
       }
 
       // Don't scroll if it's already in view.
-      if (top > window.pageYOffset + this.topMargin &&
+      if (top > window.pageYOffset &&
           top < window.pageYOffset + window.innerHeight - el.clientHeight) {
         return;
       }

polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js

@@ -29,7 +29,6 @@
       },
       comments: Object,
       projectConfig: Object,
-      topMargin: Number,
       showReplyButtons: {
         type: Boolean,
         value: false,
@@ -52,7 +51,7 @@
            offsetParent = offsetParent.offsetParent) {
         top += offsetParent.offsetTop;
       }
-      window.scrollTo(0, top - this.topMargin);
+      window.scrollTo(0, top);
       this._highlightEl(el);
     },
 

polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.html

@@ -23,7 +23,6 @@ limitations under the License.
         id="cursorManager"
         scroll="keep-visible"
         cursor-target-class="target-row"
-        fold-offset-top="[[foldOffsetTop]]"
         target="{{diffRow}}"></gr-cursor-manager>
   </template>
   <script src="gr-diff-cursor.js"></script>

polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.js

@@ -54,11 +54,6 @@
         },
       },
 
-      foldOffsetTop: {
-        type: Number,
-        value: 0,
-      },
-
       /**
        * If set, the cursor will attempt to move to the line number (instead of
        * the first chunk) the next time the diff renders. It is set back to null

polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.js

@@ -63,15 +63,6 @@
         type: String,
         value: ScrollBehavior.NEVER,
       },
-
-      /**
-       * When using the 'keep-visible' scroll behavior, set an offset to the top
-       * of the window for what is considered above the upper fold.
-       */
-      foldOffsetTop: {
-        type: Number,
-        value: 0,
-      },
     },
 
     detached: function() {
@@ -214,7 +205,7 @@
       }
 
       if (this.scroll === ScrollBehavior.KEEP_VISIBLE &&
-          top > window.pageYOffset + this.foldOffsetTop &&
+          top > window.pageYOffset &&
           top < window.pageYOffset + window.innerHeight) { return; }
 
       // Scroll the element to the middle of the window. Dividing by a third