* lisp/progmodes/prog-mode.el (prettify-symbols-unprettify-at-point):
Default to disabled (nil).
(defvar-local prettify-symbols--current-symbol-bounds nil)
-(defcustom prettify-symbols-unprettify-at-point t
+(defcustom prettify-symbols-unprettify-at-point nil
"If non-nil, show the non-prettified version of a symbol when point is on it.
If set to the symbol `right-edge', also unprettify if point
is immediately after the symbol. The prettification will be