wayland: Phase 57 — icccm_set/get/free_command store WM_COMMAND in view

Add wm_command/wm_command_n fields to wl_toplevel_view.
wl_icccm_set_command stores a deep copy of argv in the view struct;
wl_icccm_get_command returns a NULL-terminated heap copy (caller frees
each string plus the array via wl_icccm_free_command).
handle_toplevel_destroy frees the stored command on cleanup.

Update getCommandForWindow in misc.c: when dpy is NULL (Wayland path),
call wm_backend->icccm_get_command instead of returning NULL immediately.
This allows fixLeaderProperties and session.c to retrieve the command
string for Wayland-managed windows.

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

src/backend/wayland/wl_backend.c

@@ -39,6 +39,8 @@
  * window_move records WM-assigned x,y in the view struct.
  * Phase 56: prop_set/get_wm_state persist WM state (workspace, miniaturized,
  * shaded, etc.) in the view struct so wWindowGetSavedState works correctly.
+ * Phase 57: icccm_set/get/free_command store WM_COMMAND in the view struct;
+ * misc.c getCommandForWindow uses the vtable on the Wayland path.
  */
 
 #ifdef HAVE_CONFIG_H
@@ -92,6 +94,8 @@ struct wl_toplevel_view {
     int                      x, y;         /* Phase 55: WM-assigned position */
     long                    *wm_state;     /* Phase 56: saved WM state or NULL */
     int                      wm_state_n;   /* Phase 56: element count */
+    char                   **wm_command;   /* Phase 57: WM_COMMAND argv or NULL */
+    int                      wm_command_n; /* Phase 57: argument count */
     struct wl_list           link;         /* wl_state.toplevel_list */
 };
 
@@ -281,6 +285,12 @@ handle_toplevel_destroy(struct wl_listener *listener, void *data)
     wl_list_remove(&view->link);
     wl_state.managed_surface_count--;
     if (view->wm_state) wfree(view->wm_state);  /* Phase 56 */
+    if (view->wm_command) {                      /* Phase 57 */
+        int ci;
+        for (ci = 0; ci < view->wm_command_n; ci++)
+            wfree(view->wm_command[ci]);
+        wfree(view->wm_command);
+    }
     wfree(view);
 }
 
@@ -1064,9 +1074,50 @@ wl_coords_translate(WNativeWindow src, WNativeWindow dst,
 static void wl_icccm_set_wm_hints(WNativeWindow win, const WWMHints *hints) { (void)win; (void)hints; }
 static void wl_icccm_set_class_hint(WNativeWindow win, const char *wm_class, const char *wm_instance) { (void)win; (void)wm_class; (void)wm_instance; }
 static void wl_icccm_set_class_hint_if_absent(WNativeWindow win, const char *wm_class, const char *wm_instance) { (void)win; (void)wm_class; (void)wm_instance; }
-static void wl_icccm_set_command(WNativeWindow win, char **argv, int argc) { (void)win; (void)argv; (void)argc; }
-static int  wl_icccm_get_command(WNativeWindow win, char ***argv_out, int *argc_out) { (void)win; *argv_out = NULL; *argc_out = 0; return 0; }
-static void wl_icccm_free_command(char **argv) { (void)argv; }
+static void
+wl_icccm_set_command(WNativeWindow win, char **argv, int argc)
+{
+    /* Phase 57: store WM_COMMAND in the view struct. */
+    struct wl_toplevel_view *v = wl_find_view_by_id(win);
+    int i;
+    if (!v || !argv || argc <= 0) return;
+    /* free previous command if any */
+    if (v->wm_command) {
+        for (i = 0; i < v->wm_command_n; i++) wfree(v->wm_command[i]);
+        wfree(v->wm_command);
+    }
+    v->wm_command = wmalloc((size_t)argc * sizeof(char *));
+    for (i = 0; i < argc; i++)
+        v->wm_command[i] = wstrdup(argv[i] ? argv[i] : "");
+    v->wm_command_n = argc;
+}
+
+static int
+wl_icccm_get_command(WNativeWindow win, char ***argv_out, int *argc_out)
+{
+    /* Phase 57: return a NULL-terminated copy of the stored WM_COMMAND.
+     * Caller frees with wl_icccm_free_command. */
+    struct wl_toplevel_view *v = wl_find_view_by_id(win);
+    int i;
+    if (!v || !v->wm_command) { *argv_out = NULL; *argc_out = 0; return 0; }
+    /* Allocate n+1 entries (NULL-terminated for free_command iteration). */
+    *argv_out = wmalloc((size_t)(v->wm_command_n + 1) * sizeof(char *));
+    for (i = 0; i < v->wm_command_n; i++)
+        (*argv_out)[i] = wstrdup(v->wm_command[i]);
+    (*argv_out)[v->wm_command_n] = NULL;
+    *argc_out = v->wm_command_n;
+    return 1;
+}
+
+static void
+wl_icccm_free_command(char **argv)
+{
+    /* Phase 57: free NULL-terminated argv returned by wl_icccm_get_command. */
+    int i;
+    if (!argv) return;
+    for (i = 0; argv[i] != NULL; i++) wfree(argv[i]);
+    wfree(argv);
+}
 
 /* ------------------------------------------------------------------ */
 /* Fake leader                                                         */

src/misc.c

@@ -1072,7 +1072,22 @@ static char *getCommandForWindow(Window win, int elements)
 	char **argv, *command = NULL;
 	int argc;
 
-	if (!dpy) return NULL; /* Wayland: no X11 WM_COMMAND property */
+	if (!dpy) {
+		/* Wayland: read WM_COMMAND from the vtable-backed store. */
+		if (!wm_backend->icccm_get_command((WNativeWindow)win, &argv, &argc))
+			return NULL;
+		if (argc > 0 && argv != NULL) {
+			if (elements == 0)
+				elements = argc;
+			command = wtokenjoin(argv, WMIN(argc, elements));
+			if (command[0] == 0) {
+				wfree(command);
+				command = NULL;
+			}
+		}
+		wm_backend->icccm_free_command(argv);
+		return command;
+	}
 
 	if (XGetCommand(dpy, win, &argv, &argc)) {
 		if (argc > 0 && argv != NULL) {