Previously mark_pattern("") and unmark_pattern("") were silent
no-ops (glob_match returned false for empty pattern). Now they
match MC's behavior:
- mark_pattern(""): calls reverse_marks() (toggles every
entry; from 0 marks → all entries marked, vice versa)
- unmark_pattern(""): clears all marks
Tests (2 new in panel::tests):
- mark_pattern_empty_inverts_marks (0→2→0 cycle)
- unmark_pattern_empty_clears_all_marks
Total: 1276 passing (was 1274; +2 new).
kellito
790e476d8e