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What is different about GNU Emacs 19?

From the January 1992 GNU's Bulletin:

  Version 19 will enter beta test late this year.  Among its new features
  are: before and after change hooks, source-level debugging of Emacs Lisp
  programs, X selection processing (including clipboard selections),
  scrollbars, support for European character sets, floating point numbers,
  per-buffer mouse commands, X resource manager interfacing,
  mouse-tracking, Lisp-level binding of function keys, multiple X windows
  (`screens' to Emacs), a new input system, and buffer allocation, which
  uses a new mechanism capable of returning storage to the system when a
  buffer is killed.
  The input stream is now a sequence of Lisp objects, instead of a
  sequence of characters.  This allows a reasonable representation for
  mouse clicks, function keys, menu selections, etc.
  Thanks go to Alan Carroll and the people who worked on Epoch for
  generating initial feedback to a multi-windowed Emacs, and to Eric
  Raymond for help in polishing the Emacs 19 Lisp libraries.

The June 1991 GNU's bulletin had this to say about future plans for Emacs:

  Features being considered for later releases of Emacs include:
  associating property lists with regions of text in a buffer; multiple
  fonts, color, and pixmaps defined by those properties; different
  visibility conditions for the regions, and for various windows showing
  one buffer; hooks to be run if point or mouse moves outside a certain
  range; incrementally saving undo history in a file; static menu bars;
  and better pop-up menus.

Mention of this feature disappeared in the January 1992 GNU's bulletin:

  Emacs 19 supports two styles of multiple windows, one with a separate
  screen for the minibuffer, and another with a minibuffer attached to
  each screen.

Mention of these two proposed features disappeared in the January 1991 GNU's bulletin:

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