Add new command to expand all "..."s in a backtrace frame
* doc/lispref/debugging.texi (Backtraces): Document new keybinding. * lisp/emacs-lisp/backtrace.el (backtrace-line-length): Add the option of unlimited line length. (backtrace--match-ellipsis-in-string): Add a comment to explain why this function is necessary. (backtrace-mode-map): Add keybinding for 'backtrace-expand-ellipses'. (backtrace-expand-ellipsis): Use 'cl-print-to-string-with-limit'. (backtrace-expand-ellipses): New command. (backtrace-print-to-string): Use 'cl-print-to-string-with-limit'. Tag the printed forms with a gensym instead of the values of print-length and print-level. (backtrace--print): Add 'stream' argument. * test/lisp/emacs-lisp/backtrace-tests.el (backtrace-tests--expand-ellipsis): Make the test less dependent on the implementation. (backtrace-tests--expand-ellipses): New test. Move the fitting of a printed representation into a limited number of characters using appropriate values of print-level and print-length from 'backtrace-print-to-string' to cl-print.el for future use by other parts of Emacs. * lisp/emacs-lisp/cl-print.el (cl-print-to-string-with-limit): New function. * test/lisp/emacs-lisp/cl-print-tests.el (cl-print-tests-print-to-string-with-limit): New test.
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