zoom extents back to Ctrl+E and use e.preventDefault

app/assets/javascripts/src/Metamaps.Listeners.js

@@ -44,11 +44,16 @@ Metamaps.Listeners = {
           }
           break
         case 69: // if e or E is pressed
-          if (e.ctrlKey && Metamaps.Active.Topic) {
+          if (e.ctrlKey) {
+            e.preventDefault()
+            if (Metamaps.Active.Topic) {
               self.centerAndReveal(Metamaps.Selected.Nodes, {
                 center: true,
                 reveal: false
               })
+            } else if (Metamaps.Active.Map) {
+              Metamaps.JIT.zoomExtents(null, Metamaps.Visualize.mGraph.canvas)
+            }
           }
           break
         case 72: // if h or H is pressed
@@ -65,16 +70,9 @@ Metamaps.Listeners = {
             Metamaps.Control.removeSelectedEdges()
           }
           break
-        case 79: // if o or O is pressed
-          if (e.ctrlKey) {
-            e.preventDefault()
-            if (Metamaps.Active.Map) {
-              Metamaps.JIT.zoomExtents(null, Metamaps.Visualize.mGraph.canvas)
-            }
-          }
-          break
         case 82: // if r or R is pressed
           if (e.ctrlKey && Metamaps.Active.Topic) {
+            e.preventDefault()
             self.centerAndReveal(Metamaps.Selected.Nodes, {
               center: false,
               reveal: true
@@ -83,6 +81,7 @@ Metamaps.Listeners = {
           break
         case 84: // if t or T is pressed
           if (e.ctrlKey && Metamaps.Active.Topic) {
+            e.preventDefault()
             self.centerAndReveal(Metamaps.Selected.Nodes, {
               center: true,
               reveal: true

app/views/shared/_cheatsheet.html.erb

@@ -103,7 +103,7 @@
   <div id="csNavigation">    
     <div class="csItem"><span class="csTitle">Move around Canvas:</span> Click and drag</div>
     <div class="csItem"><span class="csTitle">Zoom in/out:</span> Scroll OR click on <div id="zoomIn"> </div> & <div id="zoomOut"> </div></div>
-    <div class="csItem"><span class="csTitle">Zoom to see all:</span> Click <div id="centerMap"></div> OR Ctrl + O</div>
+    <div class="csItem"><span class="csTitle">Zoom to see all:</span> Click <div id="centerMap"></div> OR Ctrl + E</div>
     <div class="csItem"><br><a href="http://metamapscc.uservoice.com/knowledgebase/articles/425784-viewing-existing-maps" target= "_blank">Learn More</a></div> 
 
   </div>