Revert "Scroll from the window when rendering entire file"

This reverts commit b07a26f2ebb24d1e9a9a20c7683fed55aab9a6bd.
Codemirror expects to be able to scroll Codemirror instance in
order to execute any line navigation. Furthermore, horizontal
scrollbars are rendered in the Codemirror at the bottom of the
document (not window). In order to have a "window" scroll bar,
we would likely have to steal the scroll bars inside Codemirror
and make it look like the window scroll bar.

Change-Id: I3199edc039ba716723eaf8032eaa5355c2100666
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/DiffTable.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/DiffTable.java
index aad2692..296cb95 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/DiffTable.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/DiffTable.java
@@ -55,7 +55,6 @@
   @UiField Element patchSetNavRow;
   @UiField Element patchSetNavCellA;
   @UiField Element patchSetNavCellB;
-  @UiField Element sidePanelCell;
   @UiField FlowPanel widgets;
   @UiField static DiffTableStyle style;
 
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/DiffTable.ui.xml b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/DiffTable.ui.xml
index 8222b48..724a87f 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/DiffTable.ui.xml
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/DiffTable.ui.xml
@@ -44,10 +44,6 @@
       width: auto;
     }
 
-    .difftable .CodeMirror {
-      height: auto;
-    }
-
     /* Preserve space for underscores. If this changes
      * see ChunkManager.addPadding() and adjust there.
      */
@@ -154,9 +150,7 @@
             </tr>
           </table>
         </td>
-        <td ui:field='sidePanelCell' class='{style.sidePanelCell}'>
-          <d:SidePanel ui:field='sidePanel'/>
-        </td>
+        <td class='{style.sidePanelCell}'><d:SidePanel ui:field='sidePanel'/></td>
       </tr>
     </table>
     <g:FlowPanel ui:field='widgets' visible='false'/>
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesBox.ui.xml b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesBox.ui.xml
index ec83dec..909e2fe 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesBox.ui.xml
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesBox.ui.xml
@@ -33,7 +33,6 @@
       font-family: arial,sans-serif;
       font-weight: bold;
       overflow: hidden;
-      position: fixed !important;
       text-align: left;
       text-shadow: 1px 1px 7px #000000;
       min-width: 300px;
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
index 0546cb9..a4dfc67 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
@@ -52,7 +52,6 @@
 import com.google.gwt.user.client.Window;
 import com.google.gwt.user.client.rpc.AsyncCallback;
 import com.google.gwt.user.client.ui.FlowPanel;
-import com.google.gwt.user.client.ui.UIObject;
 import com.google.gwtexpui.globalkey.client.GlobalKey;
 import com.google.gwtexpui.globalkey.client.KeyCommand;
 import com.google.gwtexpui.globalkey.client.KeyCommandSet;
@@ -203,8 +202,7 @@
   @Override
   public void onShowView() {
     super.onShowView();
-    Window.enableScrolling(prefs.renderEntireFile());
-    UIObject.setVisible(diffTable.sidePanelCell, !prefs.renderEntireFile());
+    Window.enableScrolling(false);
     if (prefs.hideTopMenu()) {
       Gerrit.setHeaderVisible(false);
     }
@@ -219,10 +217,8 @@
     operation(new Runnable() {
       @Override
       public void run() {
-        if (!prefs.renderEntireFile()) {
-          cmA.setHeight(height);
-          cmB.setHeight(height);
-        }
+        cmA.setHeight(height);
+        cmB.setHeight(height);
         cmA.refresh();
         cmB.refresh();
       }
@@ -470,13 +466,11 @@
 
     operation(new Runnable() {
       public void run() {
-        if (!prefs.renderEntireFile()) {
-          // Estimate initial CM3 height, fixed up in onShowView.
-          int height = Window.getClientHeight()
-              - (Gerrit.getHeaderFooterHeight() + 18);
-          cmA.setHeight(height);
-          cmB.setHeight(height);
-        }
+        // Estimate initial CM3 height, fixed up in onShowView.
+        int height = Window.getClientHeight()
+            - (Gerrit.getHeaderFooterHeight() + 18);
+        cmA.setHeight(height);
+        cmB.setHeight(height);
 
         render(diff);
         commentManager.render(comments, prefs.expandAllComments());
@@ -624,9 +618,6 @@
     return new Runnable() {
       @Override
       public void run() {
-        if (prefs.renderEntireFile()) {
-          return;
-        }
         Viewport fromTo = cm.getViewport();
         int size = fromTo.getTo() - fromTo.getFrom() + 1;
         if (cm.getOldViewportSize() == size) {
@@ -766,25 +757,17 @@
     if (prefs.renderEntireFile()) {
       cmA.addKeyMap(RENDER_ENTIRE_FILE_KEYMAP);
       cmB.addKeyMap(RENDER_ENTIRE_FILE_KEYMAP);
-      cmA.setHeight("");
-      cmB.setHeight("");
     }
 
     cmA.setOption("viewportMargin", prefs.renderEntireFile() ? POSITIVE_INFINITY : 10);
     cmB.setOption("viewportMargin", prefs.renderEntireFile() ? POSITIVE_INFINITY : 10);
-
-    Window.enableScrolling(prefs.renderEntireFile());
-    UIObject.setVisible(diffTable.sidePanelCell, !prefs.renderEntireFile());
-    resizeCodeMirror();
   }
 
   void resizeCodeMirror() {
-    if (!prefs.renderEntireFile()) {
-      int height = getCodeMirrorHeight();
-      cmA.setHeight(height);
-      cmB.setHeight(height);
-      diffTable.sidePanel.adjustGutters(cmB);
-    }
+    int height = getCodeMirrorHeight();
+    cmA.setHeight(height);
+    cmB.setHeight(height);
+    diffTable.sidePanel.adjustGutters(cmB);
   }
 
   private int getCodeMirrorHeight() {