Add Corner Radius + size.y + pixel problems in Gradient

[git2013vb]

Describe the project you are working on:
UI items
Describe the problem or limitation you are having in your project:
I made a button using "Button" Control + TextureRect to simulate a 3D button:

I have 2 problems with this approach:

1. I cannot make corner round
2. the top edge of TextureRect is not straight.

Describe the feature / enhancement and how it helps to overcome the problem or limitation:
It will be nice to set CornerRadius in Gradient to obtain this result (Inkscape):

Also: I'm forced to use scale.x instead size.y

Describe how your proposal will work, with code, pseudocode, mockups, and/or diagrams:
NA
If this enhancement will not be used often, can it be worked around with a few lines of script?:
NA
Is there a reason why this should be core and not an add-on in the asset library?:
NA

[Calinou]

Also: I'm forced to use scale.x instead size.y

This will be solved by godotengine/godot#31655 as it allows changing GradientTexture height, but it may not be merged due to the added complexity. It seems a simpler pull request that only allows rotating the GradientTexture and changing its height has an higher chance to be merged.

[git2013vb]

I see :)
I have some doubt about external shape.
It will not be more easy to add Corner Radius settings in TextureRect?

edit: why not add this feature (corner radius) to any control objects who have a corner?
It can be a Control property :) So any other control can have it

[Xrayez]

This will be solved by godotengine/godot#31655 as it allows changing GradientTexture height, but it may not be merged due to the added complexity. It seems a simpler pull request that only allows rotating the GradientTexture and changing its height has an higher chance to be merged.

There's godotengine/godot#42855 which adds a separate class for this purpose without introducing complexity to the existing GradientTexture class, lets see how it goes.