Created min size for print preview dialog and modified to allow the

ui/wm/core/focus_controller.cc

Index: ui/wm/core/focus_controller.cc
diff --git a/ui/wm/core/focus_controller.cc b/ui/wm/core/focus_controller.cc
index e1b644dccc75d72e6dd86b3849956e0d190dfdf5..2e442cd56fbe1e4e6aabd4946ccecef9d1885cee 100644
--- a/ui/wm/core/focus_controller.cc
+++ b/ui/wm/core/focus_controller.cc
@@ -12,6 +12,7 @@
 #include "ui/aura/window_tracker.h"
 #include "ui/events/event.h"
 #include "ui/wm/core/focus_rules.h"
+#include "ui/wm/core/window_modality_controller.h"
 #include "ui/wm/core/window_util.h"
 #include "ui/wm/public/activation_change_observer.h"
 
@@ -189,7 +190,11 @@ void FocusController::FocusAndActivateWindow(
   if (window &&
       (window->Contains(focused_window_) || window->Contains(active_window_))) {
     StackActiveWindow();
-    return;
+    if (HasWindowModalTransient(window) && active_window_ == window)
+      // Trying to reactivate the window, need to activate the transient first
+      ActivateWindow(HasWindowModalTransient(window));
+    else
+      return;
   }
 
   // Focusing a window also activates its containing activatable window. Note
@@ -214,6 +219,13 @@ void FocusController::FocusAndActivateWindow(
   // If the window's ActivationChangeObserver shifted focus to a valid window,
   // we don't want to focus the window we thought would be focused by default.
   bool activation_changed_focus = last_focused_window != focused_window_;
+  if ((!updating_focus_ && (!activation_changed_focus || !focused_window_)) &&
+      active_window_ && focusable &&
+      !active_window_->Contains(focusable) &&
+      (HasWindowModalTransient(active_window_) ==
+      GetToplevelWindow(window))){
+    return;
+  }
   if (!updating_focus_ && (!activation_changed_focus || !focused_window_)) {
     if (active_window_ && focusable)
       DCHECK(active_window_->Contains(focusable));
@@ -271,7 +283,7 @@ void FocusController::SetActiveWindow(
   if (updating_activation_)
     return;
 
-  if (window == active_window_) {
+  if (window == active_window_ && !HasWindowModalTransient(window)) {
     if (requested_window) {
       FOR_EACH_OBSERVER(aura::client::ActivationChangeObserver,
                         activation_observers_,