Shadow not working on PopupMenu normal panel

[JekSun97]

Tested versions

4.3 stable, 4.4 dev6

System information

Godot v4.3.stable - Windows 10.0.19045 - GLES3 (Compatibility) - Radeon RX 560 Series (Advanced Micro Devices, Inc.; 31.0.14001.45012) - Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz (4 Threads)

Issue description

Shadow does not work in PopupMenu, on normal panel.

Steps to reproduce

Create a theme, change the PopupMenu panel in Normal, try adding a shadow

Minimal reproduction project (MRP)

bg.zip

[molingyu]

It seems that because PopMenu is directly inherited from viewport. This causes it to use an independent viewport.
The viewport is clipped directly according to the size of the control, but the shadow exceeds the size of the control. This causes the shadow to be clipped. This means that not only the shadow. Any other effects that cause the control to exceed the original position will be clipped by the shadow.

By the way, I am curious about how the related effects will be performed if the native window is used (e.g. display/window/subwindows/embed_subwindows is false).

[molingyu]

Menu 是直接从 viewport 继承的。这会导致它使用独立的视区。

I just tested that if you use a native sub-window (display/window/subwindows/embed_subwindows is false), not only the shadow, but also the background color set by the theme will fail.

[molingyu]

#91333

I found a fix pr