Changes made for new feature for back button for screen tracking back with keyboard event attach

src/bitmessagekivy/main.kv

@@ -54,16 +54,6 @@ BoxLayout:
             size_hint_x: 0.1
             pos_hint: {'x': 0.8, 'y':0.4}
             on_press: app.say_exit()
-        ActionBar:
-            size_hint_y: 0.4
-            size_hint_x: 0.1
-            pos_hint: {'x': 0.99, 'y':0.35}
-            background_color: (0,0,0,0)
-            ActionView:
-                use_separator: True
-                ActionPrevious:
-                    with_previous: True
-                    on_release: app.set_previous_screen()
 
     ScreenManager:
         id: scr_mngr
@@ -352,8 +342,26 @@ BoxLayout:
 
 <Page>:
     name: 'page'
+    ActionBar:
+        background_color:0,0,0,0
+        pos_hint: {'top':0.98}
+        size_hint_y: 0.05
+        size_hint_x: 0.07
+        ActionView:
+            ActionPrevious:
+                with_previous: False
+                app_icon:  'images/back-button.png'
+                markup:True
+                font_size:"16dp"
+                on_release: app.set_previous_screen()
     Label:
-        text: 'I am on description of my email yooooo'
+        text:"Message sent on 5 september 2018 05:44"
+        color: 0,0,0,1
+        size: self.texture_size
+        size_hint: (None, None)
+
+    Label:
+        text: 'I am on description of my email yooooo I am on description of my email yooooo description description\nI am on description of my email yooooo am on description of my email yooooo description description \nI am on description of my email yooooo I am on description of my email yooooo description description \nI am on description of my email yooooo am on description of my email yooooo description description \nI am on description of my email yooooo I am on description of my email yooooo description description \nI am on description of my email yooooo am on description of my email yooooo description description \nI am on description of my email yooooo I am on description of my email yooooo description description \nI am on description of my email yooooo am on description of my email yooooo description description \nI am on description of my email yooooo I am on description of my email yooooo description description \nI am on description of my email yooooo am on description of my email yooooo description description \nI am on description of my email yooooo I am on description of my email yooooo description description \nI am on description of my email yooooo am on description of my email yooooo description description \nI am on description of my email yooooo I am on description of my email yooooo description description\nI am on description of my email yooooo I am on description of my email yooooo description description\nI am on description of my email yooooo I am on description of my email yooooo description description\nI am on description of my email yooooo I am on description of my email yooooo description description\nI am on description of my email yooooo I am on description of my email yooooo description description\n'
         color: 0,0,0,1
 
 <AddressSuccessful>:

src/bitmessagekivy/mpybit.py

@@ -50,7 +50,7 @@ class NavigateApp(App, TextInput):
     def set_previous_screen(self):
         if self.root.ids.scr_mngr.current != 'inbox':
             self.root.ids.scr_mngr.transition.direction = 'left'
-            self.root.ids.scr_mngr.current = self.root.ids.scr_mngr.previous()
+            self.root.ids.scr_mngr.current = 'inbox'
 
     def getCurrentAccountData(self, text):
         """Get Current Address Account Data."""