[Android] fix: screen height wrong. Not catering correctly for action bar. Height was wrong after pushing and popping screens with different combinations of bar being shown/hidden

Author: hboon

flow/ui/android/navigation.rb

@@ -31,10 +31,11 @@ def hide_bar
     if bar.isShowing
       bar.hide
       Task.after 0.05 do
-        screen = @current_screens.last
         bar_height = bar.height>0 ? bar.height : self.class.bar_height
-        screen.view.height += (bar_height / UI.density)
-        screen.view.update_layout
+        @current_screens.each do |e|
+          e.view.height += (bar_height / UI.density)
+          e.view.update_layout
+        end
       end
     end
   end
@@ -44,10 +45,11 @@ def show_bar
     if !bar.isShowing
       bar.show
       Task.after 0.05 do
-        screen = @current_screens.last
         bar_height = bar.height>0 ? bar.height : self.class.bar_height
-        screen.view.height -= (bar_height / UI.density)
-        screen.view.update_layout
+        @current_screens.each do |e|
+          e.view.height -= (bar_height / UI.density)
+          e.view.update_layout
+        end
       end
     end
   end