Fix minor issue with mouse cursor in the command tree.

When hovering in the counter area on a row where the command in the tree
portion of the view is truncated, the mouse may change to the hand cursor,
when it shouldn't, as it is looking at the truncated portion of the
command when determining if there's a link under the mouse cursor.

gapic/src/main/com/google/gapid/views/CommandTree.java

@@ -1189,7 +1189,12 @@ private void updateHover(int ex, int ey) {
       }
     }
 
-    updateCursor(ex - size.tree.x + treeHBar.getSelection());
+    if (ex < size.tree.x || ex >= size.tree.x + size.tree.w) {
+      setCursor(null);
+    } else {
+      double x = ex - size.tree.x + treeHBar.getSelection();
+      setCursor(getFollow(x) != null ? getDisplay().getSystemCursor(SWT.CURSOR_HAND) : null);
+    }
   }
 
   private void checkHoveredRow() {
@@ -1237,10 +1242,6 @@ private boolean shouldShowImage(CommandStream.Node node) {
         node.getData() != null && !node.getData().getGroup().isEmpty();
   }
 
-  private void updateCursor(double x) {
-    setCursor(getFollow(x) != null ? getDisplay().getSystemCursor(SWT.CURSOR_HAND) : null);
-  }
-
   @Override
   public boolean setFocus() {
     return forceFocus();