I always have this problem of touching the "Pickup all" button on the lower right corner of the Edit Base screen accidentally and am forced to redo it from where I last saved it(which usually means to redo the editing from the state my base was in before editing). I am sure someone would say it could be solved simply by constantly saving it. However, it's impossible to do that after every modification I make, and if that base is the only current active base, the system wouldn't allow it to be saved till it's completed. Moreover, bezels of smart phones nowadays are aiming to get thiner and thiner, which also means it would be more prone to touching the screen accidentally.
To counter this unavoidable issue, I suggest that a "Undo/Redo" option should be implemented, so that player can undo the "Pickup all" effect of clearing everything if accidentally touched it. Better still, if there's a popup window that comes up, like the popup window that comes up when trying to attack in multiplayer mode when on Peace Treaty, to confirm whether the person editing the base really want to "pickup all" and do a redesign of their base from scratch.
To counter this unavoidable issue, I suggest that a "Undo/Redo" option should be implemented, so that player can undo the "Pickup all" effect of clearing everything if accidentally touched it. Better still, if there's a popup window that comes up, like the popup window that comes up when trying to attack in multiplayer mode when on Peace Treaty, to confirm whether the person editing the base really want to "pickup all" and do a redesign of their base from scratch.