RichTextLabel shadows ignore text alpha.

[teebarjunk]

Godot version

v4.0.alpha4.official [f470979]

System information

Kubuntu 21.04, 64-bit, AMD Radeon HD 8800

Issue description

RichTextLabel shadow alpha isn't multiplied by the alpha of the text. The included minimal reproduction project shows that RichTextEffect has the same problem.

Some [color=#ffffffff]100% alpha[/color] text.
Some [color=#ffffff80]50% alpha[/color] text.
Some [color=#ffffff00]0% alpha[/color] text.

Steps to reproduce

Create a RichTextLabel.
Enable Theme Overrides/Colors/Font Shadow Color.
Enable BBCode.
Paste:

Some [color=#ffffffff]100% alpha[/color] text.
Some [color=#ffffff80]50% alpha[/color] text.
Some [color=#ffffff00]0% alpha[/color] text.

Minimal reproduction project

temp_rich_text_shadows.zip

[Calinou]

@teebarjunk Can you reproduce this in 3.4.3 as well?

[teebarjunk]

(edit: I'll dld 3.4.3 and test.)
Same problem in:
v3.4.beta6.official [3e2bb41]
v3.5.beta1.official [b9b23d2]
edit2: v3.4.3.stable.official [242c05d]

Whether I use RichTextEffect or just [color][/color].