Files
andros 4c35e112a4 Add native Wayland support to the OpenGL backend via PGTK
Third platform binding, alongside NS/Metal (macOS) and X11/GL: PGTK
frames reuse gfxterm.c (drawing policy) and glterm.c (EGL/GLES driver)
with new window plumbing only.  Works both under native Wayland and
under X11 via GDK.

- configure: --with-gpu now also accepts --with-pgtk builds; detects
  wayland-egl (HAVE_WAYLAND_EGL).
- EGL surface glue for three cases: X11 (Xlib window), PGTK/X11 (GDK
  XID via dlsym, no gdkx.h), PGTK/Wayland (wl_egl_window on a desync
  wl_subsurface anchored at the edit area, so GDK's own commits and the
  GTK menu bar never conflict with GPU frames).
- Wayland present timing by wl_surface.frame callback; HiDPI scale fed
  from the GDK scale factor; double surfaceless fallback when the
  native EGL display has no usable configs.
- Toolkit scroll bars: native windows on X11 sessions (the server
  clips presents under them); on Wayland an alpha-bearing EGL config
  plus transparent holes punched at the bar rects let GTK's scroll
  bars show through the subsurface.
- Glyph atlas rasterized with FreeType flags derived from the cairo
  scaled font options, matching GTK's slight hinting on PGTK while
  keeping X11 output unchanged.
- gpu-transition-active-p on both backends (GL and Metal): reports a
  running buffer-switch cross-fade without advancing it.
- pgtk-win.el: auto-enable the backend on startup, honoring
  EMACS_GPU_DISABLE, like x-win.el and ns-win.el.

Verified with the emacs-gpu-qa layer-1 suite: 16/16 PASS on PGTK+X11
(Xvfb), 16/16 PASS on native Wayland (sway headless), 16/16 PASS
unchanged on plain X11, plus an 18/18 functional smoke on Wayland
(transitions, cursor effects, pump, GStreamer video, captures).  All
under llvmpipe in containers: not yet validated on real Wayland
hardware.  macOS (Metal) remains the primary, fully supported
platform.
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This directory contains source code for the parts of Emacs that are
written in Emacs Lisp.  *.el files are Emacs Lisp source, and the
corresponding *.elc files are byte-compiled versions.  Byte-compiled
files are architecture-independent.

The term subdirectory contains Lisp files that customize Emacs for
certain terminal types.  When Emacs starts, it checks the TERM
environment variable to get the terminal type and loads
'term/${TERM}.el' if it exists.

The other subdirectories hold Lisp packages grouped by their general
purpose.