Defer triggering `so-long' until the buffer is displayed
* lisp/so-long.el (so-long-invisible-buffer-function): New user option. (so-long--set-auto-mode): Use so-long-invisible-buffer-function. (so-long-deferred): New function/value for so-long-invisible-buffer-function. (so-long, so-long--disable): Support for so-long-deferred. * test/lisp/so-long-tests/autoload-longlines-mode-tests.el * test/lisp/so-long-tests/autoload-major-mode-tests.el * test/lisp/so-long-tests/autoload-minor-mode-tests.el * test/lisp/so-long-tests/so-long-tests.el: Support for so-long-deferred. Pre-existing tests have been updated to ensure the buffer is already displayed in cases where a call to `normal-mode' is the (potential) trigger for `so-long'.
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