Updates to Display chapter of Lisp manual.
* doc/lispref/display.texi (Fringes): Note that fringes are shown on graphical displays only. (Fringe Size/Pos, Fringe Bitmaps, Making Buttons): Clarifications. (Replacing Specs): Clarify example. (Manipulating Buttons): Note that button-at can return a marker. (Buttons): Minor rewrite. (Character Display): New node. Consolidate all character display related nodes into its subsections. (Usual Display): Character 127 is also affected by ctl-arrow. (Display Tables): Improve example. * lisp/button.el (button-at): Minor addition to docstring.
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