Merge from origin/emacs-26

Merge from origin/emacs-26

5cb3991 Fix a typo in emacs-lisp-intro.texi
d6aa55e Avoid segfaults in replace-buffer-contents with large buffers
d22b8d1 Adjust for scaling for mode-line popup menus (Bug#31880)
3d2e3dc Change name of `seqp' argument (Bug#26411)
40e1db8 Change index of ";" to better reflect it's usage (Bug#31623)
d289e7e Fix bug of 'mouse-drag-and-drop-region' to detect edges of re...
e292c09 Fix #'fun handling inside `labels' (Bug#31792)