Make todo-show work when adding and deleting a new todo file
* lisp/calendar/todo-mode.el (todo-add-file): Since todo-current-todo-file must be set before calling todo-show, but the buffer is not yet in todo-mode, which makes it buffer local, explicitly set it buffer locally (bug#32627). * test/lisp/calendar/todo-mode-tests.el (todo-test--add-file) (todo-test--delete-file): New functions. (todo-test-add-and-delete-file): New test.
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