Avoid crashes when casifying noncontiguous regions
This is a followon fix for Bug#37477. * lisp/simple.el (region-extract-function): Use setq here, since the var is now defined in C code. * src/casefiddle.c (casify_pnc_region): New function. (Fupcase_region, Fdowncase_region, Fcapitalize_region) (Fupcase_initials_region): Use it. (Fupcase_initials_region): Add region-noncontiguous-p flag for consistency with the others. All uses changed. (syms_of_casefiddle): Define Qbounds, Vregion_extract_function. * src/insdel.c (prepare_to_modify_buffer_1): * src/keyboard.c (command_loop_1): Use Vregion_extraction_function. * src/insdel.c (syms_of_insdel): No need to define Qregion_extract_function. * test/src/casefiddle-tests.el (casefiddle-oldfunc): New var. (casefiddle-loopfunc, casefiddle-badfunc): New functions. (casefiddle-invalid-region-extract-function): New test.
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