wayland: Validate and trigger the repositioning of popups in more cases

Validate and reposition popups in any case where the position or size may have changed. In particular, this fixes cases where the position parameters were adjusted while the window was hidden, as the new values weren't being applied in all cases.

src/video/wayland/SDL_waylandwindow.c

@@ -421,6 +421,25 @@ static void GetPopupPosition(SDL_Window *popup, int x, int y, int *adj_x, int *a
     }
 }
 
+static void RepositionPopup(SDL_Window *window)
+{
+    SDL_WindowData *wind = window->driverdata;
+
+    if (wind->shell_surface_type == WAYLAND_SURFACE_XDG_POPUP &&
+        wind->shell_surface.xdg.roleobj.popup.positioner &&
+        xdg_popup_get_version(wind->shell_surface.xdg.roleobj.popup.popup) >= XDG_POPUP_REPOSITION_SINCE_VERSION) {
+        int x, y;
+
+        EnsurePopupPositionIsValid(window);
+        GetPopupPosition(window, window->x, window->y, &x, &y);
+        xdg_positioner_set_size(wind->shell_surface.xdg.roleobj.popup.positioner, window->w, window->h);
+        xdg_positioner_set_offset(wind->shell_surface.xdg.roleobj.popup.positioner, x, y);
+        xdg_popup_reposition(wind->shell_surface.xdg.roleobj.popup.popup,
+                             wind->shell_surface.xdg.roleobj.popup.positioner,
+                             0);
+    }
+}
+
 static const struct wl_callback_listener surface_frame_listener;
 
 static void surface_frame_done(void *data, struct wl_callback *cb, uint32_t time)
@@ -1331,6 +1350,7 @@ void Wayland_ShowWindow(_THIS, SDL_Window *window)
             xdg_positioner_set_size(data->shell_surface.xdg.roleobj.popup.positioner, window->w, window->h);
 
             /* Set the popup initial position */
+            EnsurePopupPositionIsValid(window);
             GetPopupPosition(window, window->x, window->y, &position_x, &position_y);
             xdg_positioner_set_offset(data->shell_surface.xdg.roleobj.popup.positioner, position_x, position_y);
 
@@ -2129,20 +2149,12 @@ int Wayland_SetWindowPosition(_THIS, SDL_Window *window)
     SDL_WindowData *wind = window->driverdata;
 
     /* Only popup windows can be positioned relative to the parent. */
-    if (wind->shell_surface_type == WAYLAND_SURFACE_XDG_POPUP) {
+    if (wind->shell_surface_type == WAYLAND_SURFACE_XDG_POPUP && wind->shell_surface.xdg.roleobj.popup.popup) {
         if (xdg_popup_get_version(wind->shell_surface.xdg.roleobj.popup.popup) < XDG_POPUP_REPOSITION_SINCE_VERSION) {
             return SDL_Unsupported();
         }
-        if (!(window->flags & SDL_WINDOW_HIDDEN)) {
-            int x, y;
 
-            EnsurePopupPositionIsValid(window);
-            GetPopupPosition(window, window->x, window->y, &x, &y);
-            xdg_positioner_set_offset(wind->shell_surface.xdg.roleobj.popup.positioner, x, y);
-            xdg_popup_reposition(wind->shell_surface.xdg.roleobj.popup.popup,
-                                 wind->shell_surface.xdg.roleobj.popup.positioner,
-                                 0);
-        }
+        RepositionPopup(window);
         return 0;
     }
     return SDL_SetError("wayland cannot position non-popup windows");
@@ -2167,6 +2179,7 @@ void Wayland_SetWindowSize(_THIS, SDL_Window *window)
         wind->requested_window_height = window->windowed.h;
 
         ConfigureWindowGeometry(window);
+        RepositionPopup(window);
     }
 
     /* Always commit, as this may be in response to a min/max limit change. */