do not allow set client size less than its min size

client.h

@@ -179,3 +179,23 @@ client_surface_at(Client *c, double cx, double cy, double *sx, double *sy)
 #endif
 	return wlr_xdg_surface_surface_at(c->surface.xdg, cx, cy, sx, sy);
 }
+
+static inline void
+client_min_size(Client *c, int *width, int *height)
+{
+	struct wlr_xdg_toplevel *toplevel;
+	struct wlr_xdg_toplevel_state *state;
+#ifdef XWAYLAND
+	if (client_is_x11(c)) {
+		struct wlr_xwayland_surface_size_hints *size_hints;
+		size_hints = c->surface.xwayland->size_hints;
+		*width = size_hints->min_width;
+		*height = size_hints->min_height;
+		return;
+	}
+#endif
+	toplevel = c->surface.xdg->toplevel;
+	state = &toplevel->current;
+	*width = state->min_width;
+	*height = state->min_height;
+}

dwl.c

@@ -1636,11 +1636,13 @@ rendermon(struct wl_listener *listener, void *data)
 void
 resize(Client *c, int x, int y, int w, int h, int interact)
 {
+	int min_width = 0, min_height = 0;
 	struct wlr_box *bbox = interact ? &sgeom : &c->mon->w;
+	client_min_size(c, &min_width, &min_height);
 	c->geom.x = x;
 	c->geom.y = y;
-	c->geom.width = w;
-	c->geom.height = h;
+	c->geom.width = MAX(min_width + 2 * c->bw, w);
+	c->geom.height = MAX(min_height + 2 * c->bw, h);
 	applybounds(c, bbox);
 
 	/* Update scene-graph, including borders */