[CRD iOS] Preserve viewport state when toggling the soft keyboard

remoting/client/ui/desktop_viewport.cc

Index: remoting/client/ui/desktop_viewport.cc
diff --git a/remoting/client/ui/desktop_viewport.cc b/remoting/client/ui/desktop_viewport.cc
index c150f1bb6b02f4e58ab31bbc9bf372b1852ef27a..77a9d9e6f9205bc7d37b6d968e9d7258ba9e7cf2 100644
--- a/remoting/client/ui/desktop_viewport.cc
+++ b/remoting/client/ui/desktop_viewport.cc
@@ -35,9 +35,21 @@ void DesktopViewport::SetSurfaceSize(int surface_width, int surface_height) {
     return;
   }
 
+  // Only reset the viewport if both dimensions have changed. This is to
+  // preserve the viewport state in case the surface is just scrolled up.

[nicholss, 2017/05/26 20:12:49]

The keyboard showing changes the size of the viewport. so this comment is not
correct

[Yuwei, 2017/05/30 19:27:08]

Done.

+  // E.g. when showing the soft keyboard.
+  bool need_to_reset =
+      surface_width != surface_size_.x && surface_height != surface_size_.y;
+
   surface_size_.x = surface_width;
   surface_size_.y = surface_height;
-  ResizeToFit();
+
+  if (need_to_reset) {
+    ResizeToFit();
+    return;
+  }
+
+  UpdateViewport();
 }
 
 void DesktopViewport::MoveDesktop(float dx, float dy) {