commit b726211b9b9eefeaabf5ba366565792e943a18b6
Author:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
AuthorDate: Fri May 3 21:55:01 2024 +0200
Commit:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
CommitDate: Fri May 3 21:55:01 2024 +0200

    Wayland: use frame_cb before redrawing GL subwindows (#967)

 src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
index 00c1ab0..5f96480 100644
--- src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
+++ src/drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx
@@ -357,6 +357,13 @@ void Fl_Wayland_Gl_Window_Driver::swap_buffers() {
   }
 
   if (egl_surface) {
+    if (pWindow->parent()) {
+      struct wld_window *xid = fl_wl_xid(pWindow);
+      if (xid->frame_cb) return;
+      xid->frame_cb = wl_surface_frame(xid->wl_surface);
+      wl_callback_add_listener(xid->frame_cb, Fl_Wayland_Graphics_Driver::p_surface_frame_listener,
+                               xid);
+    }
     eglSwapBuffers(Fl_Wayland_Gl_Window_Driver::egl_display, egl_surface);
   }
 }