Resource sometimes running code in editor without @tool annotation

[GivenFlesh]

Tested versions

Reproducible in 4.4

System information

Windows 10

Issue description

If a resource without the @tool annotation is created from within a resource that has the @tool annotation, such as with a setter that autofills array entries, any script inside of the created resource will run even if it does not have the @tool annotation.

Steps to reproduce

• Create two resource scripts
• Give one the @tool annotation
• Give them both a class name
• In the @tool enabled resource, create an export variable that contains an array
• Create a setter for that variable that fills 'null' values with new copies of the other resource
• In the other resource, create an export variable with a setter of any kind. For ease of testing, a boolean that = true, and setting it always makes the value true
• Create a new resource of the @tool annotated resource.
• Increase the size of the array. If a new copy of the second resource does not automatically fill, reload the project.
• Attempt to turn the variable of the new resource to false.

This does not apply to copies created manually, either through 'new resource' or right clicking in the file dock, only resources created through script in an @tool annotated script.

Minimal reproduction project (MRP)

MRP.zip

[KoBeWi]

We should probably improve documentation on @tool.

Non-tool scripts can run in the editor too. A difference between running and non-running script is a ScriptInstance. It's created automatically at runtime, but not created in the editor unless the script is tool. This only applies to attached scripts. By doing script.new(), you are creating instance directly and thus the script is able to run in the editor.

[ydeltastar]

KoBeWi's comment is the workaround. Just don't call new(), at least not directly.

Do the same as the editor. Create an instance of the base native class and attach the script to it. This avoids creating the script instance and the resource works the same in the inspector.

var res = Resource.new()
res.set_script(NonToolResource)
new_array[index] = res