[client] wayland: fix fullscreen option launch bug

client/displayservers/Wayland/desktops/libdecor/libdecor.c

@@ -75,11 +75,7 @@ static void libdecorFrameConfigure(struct libdecor_frame * frame,
     struct libdecor_configuration * configuration, void * opaque)
 {
   if (!state.configured)
-  {
     xdg_surface_ack_configure(libdecor_frame_get_xdg_surface(frame), configuration->serial);
-    state.configured = true;
-    return;
-  }
 
   int width, height;
   if (libdecor_configuration_get_content_size(configuration, frame, &width, &height))
@@ -96,6 +92,12 @@ static void libdecorFrameConfigure(struct libdecor_frame * frame,
   if (libdecor_configuration_get_window_state(configuration, &windowState))
     state.fullscreen = windowState & LIBDECOR_WINDOW_STATE_FULLSCREEN;
 
+  if (!state.configured)
+  {
+    state.configured = true;
+    return;
+  }
+
   state.resizeSerial = configuration->serial;
   waylandNeedsResize();
 }

client/displayservers/Wayland/desktops/xdg/xdg.c

@@ -93,8 +93,13 @@ static const struct xdg_surface_listener xdgSurfaceListener = {
 static void xdgToplevelConfigure(void * data, struct xdg_toplevel * xdgToplevel,
     int32_t width, int32_t height, struct wl_array * states)
 {
-  state.width      = width;
-  state.height     = height;
+  // A zero size means that the compositor is leaving the size up to us.
+  if (width > 0 && height > 0)
+  {
+    state.width  = width;
+    state.height = height;
+  }
+
   state.fullscreen = false;
   state.floating   = true;
 

client/displayservers/Wayland/wayland.c

@@ -172,9 +172,16 @@ static bool waylandInit(const LG_DSInitParams params)
         params.borderless, params.resizable))
     return false;
 
-  if (!waylandEGLInit(params.w, params.h))
+  int width, height;
+  wlWm.desktop->getSize(&width, &height);
+
+  if (!waylandEGLInit(waylandScaleMulInt(wlWm.scale, width),
+        waylandScaleMulInt(wlWm.scale, height)))
     return false;
 
+  app_handleResizeEvent(width, height, waylandScaleToDouble(wlWm.scale),
+      (struct Border) {0, 0, 0, 0});
+
   waylandIconInit();
 
 #ifdef ENABLE_OPENGL

client/displayservers/Wayland/window.c

@@ -152,6 +152,18 @@ bool waylandWindowInit(const char * title, const char * appId, bool fullscreen,
     return false;
 
   wl_surface_commit(wlWm.surface);
+
+  // The initial configure supplies the compositor-selected size for states
+  // such as fullscreen. It must be received before the first buffer is made.
+  while (!wlWm.desktop->configured())
+  {
+    if (wl_display_roundtrip(wlWm.display) < 0)
+    {
+      DEBUG_ERROR("Failed waiting for the initial Wayland configure");
+      return false;
+    }
+  }
+
   return true;
 }