Don't try to import unknown dependency from scan

[WindyDarian]

Only import dependency we know how to import, since custom resource may have .gd in dependency list which doesn't have an importer

I was encountering BUG: File queued for import, but can't be imported, importer for type '' not found. when I modified my resource file that has custom importer addon. The code was trying to reimport script file (".gd") of my resource, which can't be imported.

After seeing similar issues ( #45524 , #46288 and #51816 ), I think this is the right thing to do?

Should fix #46288

Bugsquad edit:

• Fixes error messages in Automatic reimport of a modified 3D asset succeeds once, then later fails #45524
• Fixes Import plugin for custom resource fails to re-import #46288
• Fixes EditorImportPlugin throws errors when moving imported file that's saved as a custom resource. #51816

[mhilbrunner]

Approved in today's PR meeting

[akien-mga]

Thanks!

[akien-mga]

Cherry-picked for 3.6.

[timothyqiu]

Cherry-picked for 3.5.2

[caimantilla]

Is this supposed to be fixed for 4.x? I'm on 4.1 Beta 2 and keep getting the BUG: File queued for import, but can't be imported, importer for type '' not found. error when trying to import a binary file as custom resource. Whether _get_resource_type returns "Resource" or "DBAM_AnimationData" doesn't affect this. Is there some workaround I'm missing?

Update: It's a documentation/nondescript error issue. Not overriding, or returning 0.0, from _get_priority, was causing it.

[Calinou]

Update: It's a documentation/nondescript error issue. Not overriding, or returning 0.0, from _get_priority, was causing it.

If that's the case, we should define a default return value that makes the import plugin be successful out of the box.