Facts: - In GTK and WPE since on-or-about 28 March 2023, fast/hidpi/filters-drop-shadow.html has been failing in these ports according to results.webkit.org; - Prior to this, there was some flakiness for WPE, some crashes while GTK succeeded. Speculation: This may be related to some changes in 261827@main, described in webkit.org/b/254062 wrt CSSFilter geometry and clipping.