wayland: Phase 60 — guard wsmap X11/rcontext paths; icon name from XDG title

wWorkspaceMapUpdate calls XGetImage(dpy) and RCreateImageFromXImage
(scr->rcontext) directly; both are NULL in the Wayland path.  Add
early-return guards so enabling the workspace pager in Wayland mode
does not crash.

set_workspace_map_background_image calls RConvertImageMask(scr->rcontext)
for pixmap textures; guard that path with the same rcontext check.

wl_window_get_icon_name was a stub returning False.  Implement it to
return the XDG toplevel title so window icon labels are populated on
the Wayland path (Wayland has no separate WM_ICON_NAME concept).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/backend/wayland/wl_backend.c

@@ -901,7 +901,21 @@ wl_window_fetch_name(WNativeWindow win, char **name_out)
 
 static Bool
 wl_window_get_icon_name(WNativeWindow win, char **name_out)
-{ (void)win; *name_out = NULL; return False; }
+{
+    /* Phase 60: Wayland has no separate icon-name concept; return the
+     * XDG toplevel title (same as window_fetch_name) so the WM always
+     * has something to display in icon labels. */
+    struct wl_toplevel_view *v = wl_find_view_by_id(win);
+    const char *title = (v && v->xdg_surface && v->xdg_surface->toplevel &&
+                         v->xdg_surface->toplevel->title)
+                        ? v->xdg_surface->toplevel->title : NULL;
+    if (title) {
+        *name_out = strdup(title);
+        return True;
+    }
+    *name_out = NULL;
+    return False;
+}
 
 static int
 wl_prop_get_wmaker_menu(WNativeWindow win,

src/wsmap.c

@@ -66,6 +66,9 @@ void wWorkspaceMapUpdate(WScreen *scr)
 {
 	XImage *pimg;
 
+	if (!dpy || !scr->rcontext)
+		return; /* Wayland: no X11 root image to capture */
+
 	pimg = XGetImage(dpy, scr->root_win, 0, 0,
 	                 scr->scr_width, scr->scr_height,
 	                 AllPlanes, ZPixmap);
@@ -152,6 +155,9 @@ static void set_workspace_map_background_image(WWorkspaceMap *wsmap)
 {
 	Pixmap pixmap, mask;
 
+	if (!wsmap->scr->rcontext)
+		return; /* Wayland: no X11 rendering context */
+
 	if (wPreferences.wsmbackTexture->any.type == WTEX_PIXMAP) {
 		RImage *tmp = wTextureRenderImage(wPreferences.wsmbackTexture, wsmap->wswidth, wsmap->wsheight, WREL_FLAT);