It's impossible to leave fullscreen mode via touchscreen
Hello!
After (maybe accindental) switch to fullscreen mode it's impossible to switch back to windowed mode via touchscreen. It could cause at least two following problems:
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If device have hardware Meta button (like most of the x86 tablets) user could press it and just close Gnome Terminal emulator. However, this is undesirable if there was few tabs open and another tab have running process that should be finished (for example file copying operation that running on remote server).
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If there is no hardware Meta button (like HP Elite x2 1013 G3 Thinkpad X1 Tablet 3rd Gen) and typing exit is impossible for some reason (running "dmesg -w", stalled ssh session, etc.) there is no way to get access to other applications besides long power button press (because many tablet users configure power button action to suspend from short press).