Three issues prevented WPrefs from being managed by wmaker in X11:
1. W_X11OpenDisplay: XOpenDisplay("") fails; treat empty string as NULL
so it falls back to DISPLAY env var.
2. wevent_x11.c/wevent.c: MapRequest and ConfigureRequest events must
bypass WINGs view lookup (both _view_target in x11_fetch and
W_GetViewForWindow in WMHandleEvent) to reach DispatchEvent via
extraEventHandler.
3. wview_x11.c: x11_create_root must use RootWindow() not
scr->rootWin (which may be an intermediate window created by
RCreateContext for non-default visuals). Otherwise toplevel
WINGs windows are created as children of the wrong parent and
their MapRequest never reaches the WM.
The wmeMaskForType table had WME_CLIENT_MESSAGE mapped to 0, so
WMHandleEvent never dispatched client messages to registered handlers.
The window close handler (registered with ClientMessageMask) was never
called. Set the correct mask so the deleteWindow protocol works.
During W_RealizeView, child views with mapWhenRealized triggered
wl_map which called wl_redisplay on the toplevel. This ran expose
handlers on a partially-realized widget tree, causing backing image
corruption from resizes during redisplay.
Fix: track realization depth with W_WL_Realizing counter. wl_map
skips redisplay when realization is in progress. After the outermost
W_RealizeView completes, trigger a single redisplay of the toplevel
to paint everything correctly.
Remove the verbose COMPOSITE fprintf and BAD composite warning that
were used for debugging. Keep the source/destination bounds clipping
as it correctly handles the case where view->size diverges from the
backing image dimensions during realization.
The font prefs panel crashed because wl_resize called wl_redisplay
while already inside a redisplay. This caused expose handlers to
trigger more resizes, creating unbounded recursion and memory growth
(backing images growing to 1024+ pixels wide). Skip the redisplay
from wl_resize when wl_redisplay_depth > 0 — the ongoing parent
redisplay will composite the resized child at its new size.
The previous source-only clamp was insufficient. Also check that both
src and dst have non-NULL pixel data, and clip the composite region to
the destination image dimensions to prevent out-of-bounds writes.
During W_RealizeView the WME_EXPOSE handler can trigger child resizes
that make view->size exceed the backing image dimensions. Clamp the
composite width/height to the source image actual size to prevent
out-of-bounds reads in pixman_image_composite32.
Font prefs panel crashed in pixman_image_composite32 during W_MapView
because a child view had zero width/height. Skip compositing for
zero-sized views.
In Wayland mode the X11 display is NULL. WMCreateColorWell calls
WMRegisterViewForDraggedTypes which calls XInternAtom, crashing.
Bail early when display is NULL since X11 DnD is not available.
Window Maker