Double clicking JSON files in FileSystem tab throws errors

[arotter]

Godot version

v4.0.beta2.official [f8745f2]

System information

Windows 10 21H2 (Build 19044.2075)

Issue description

In beta1 was able to double click a JSON file shown in the FileSystem tab to open it in the script editor view as a text file. Doing the same in beta2 throws the following errors for the file:

ERROR: Failed loading resource: res://static_data/weapons/DamageBehaviors.json. Make sure resources have been imported by opening the project in the editor at least once.
   at: (core/io/resource_loader.cpp:221)
ERROR: Condition "!res.is_valid()" is true. Returning: ERR_CANT_OPEN
   at: load_resource (editor/editor_node.cpp:1248)

Accessing the file via FileAccess and parsing it via JSON.parse() works without problems, as does dragging the file from FileSystem into the script editor's vertical tab space.

Steps to reproduce

1. Add JSON file to folder in res://
2. Double click on file
3. File doesn't open as expected, errors in console

Using the attached project:

1. Open project
2. Double click res://static_data/weapons/DamageBehaviors.json
3. File doesn't open as expected, errors in console

Minimal reproduction project

BugReproduction.zip

[akien-mga]

That's due to #65295. JSON is now treated as a resource file but it's not an imported one, and apparently the FileSystem dock logic for double click doesn't know how to handle this.