Fix sxhash-equal on bytecodes, markers, etc.
Problem reported by Pip Cet (Bug#38912#14). * doc/lispref/objects.texi (Equality Predicates): Document better when ‘equal’ looks inside objects. * doc/lispref/windows.texi (Window Configurations): Don’t say that ‘equal’ looks inside window configurations. * etc/NEWS: Mention the change. * src/fns.c (internal_equal): Do not look inside window configurations. (sxhash_obj): Hash markers, byte-code function objects, char-tables, and font objects consistently with Fequal. * src/window.c (compare_window_configurations): Now static. Remove last argument. Caller changed. * test/lisp/ffap-tests.el (ffap-other-window--bug-25352): Use compare-window-configurations, not ‘equal’. * test/src/fns-tests.el (test-sxhash-equal): New test.
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