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logind: fix seat_can_tty() to check for VTs
A seat provides text-logins if it has VTs. This is always limited to seat0 so the seat_is_seat0() check is correct. However, if VTs are disabled, no seat provides text-logins so we also need to check for the console-fd. This was previously: return seat_is_vtconsole(); It looked right, but was functionally equivalent to seat_is_seat0(). The rename of this helper made it more obvious that it is missing the VT test.
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@ -445,7 +445,7 @@ bool seat_can_multi_session(Seat *s) {
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bool seat_can_tty(Seat *s) {
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assert(s);
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return seat_is_seat0(s);
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return seat_is_seat0(s) && s->manager->console_active_fd >= 0;
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}
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bool seat_has_master_device(Seat *s) {
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