Changed focus child to simpler mod+Escape.

i3/config

@@ -220,7 +220,7 @@ bindsym $mod+$mod_next+d exec xprop -id $(xdotool getactivewindow) -remove ANTID
 
 # focus the parent container
 bindsym $mod+a focus parent
-bindsym $mod+Shift+a focus child
+bindsym $mod+Escape focus child
 
 # move the currently focused window to the scratchpad
 bindsym $mod+Shift+Tab move scratchpad

i3/config.simple

@@ -137,7 +137,7 @@ bindsym $mod+Ctrl+s sticky toggle; exec notify-send 'sticky windows toggled'
 
 # focus the parent container
 bindsym $mod+a focus parent
-bindsym $mod+Shift+a focus child
+bindsym $mod+Escape focus child
 
 # move the currently focused window to the scratchpad
 bindsym $mod+Shift+Tab move scratchpad