xdg-shell: set resizing state during interactive resize

river/View.zig

@@ -338,6 +338,13 @@ pub fn setFullscreen(self: Self, fullscreen: bool) void {
     }
 }
 
+pub fn setResizing(self: Self, resizing: bool) void {
+    switch (self.impl) {
+        .xdg_toplevel => |xdg_toplevel| xdg_toplevel.setResizing(resizing),
+        .xwayland_view => unreachable,
+    }
+}
+
 pub inline fn forEachPopupSurface(
     self: Self,
     comptime T: type,