Assign temporary path to preloaded resources

[KoBeWi]

Fixes #72854 in a safe and very hacky way.
The issue is waiting for a "proper" fix (see the discussion in #72257), but it kept annoying me in the meantime so I'm coming with another hack 🤷‍♂️

I added a method to Resource that sets the path completely bypassing the cache, so Resource.get_path() will return the "correct" path, while not causing unwanted side-effects. The method is called for built-in resources loaded with CACHE_MODE_IGNORE.

It was not enough, because GDScript keeps its own path, set with the regular set_path() method. I could make set_temporary_path() virtual, but instead I added a flag to track whether the path is valid and try returning get_path() if it's not.

Here's an extended MRP for the debugger bug that this fixes:
PreloadBug.zip
Preloaded built-in scripts still can't be clicked for some reason, but at least you can see their path.

EDIT:
Fixes #80812

[reduz]

Have not looked in depth but since its hacky, maybe better to use a metadata, then clear it?

[KoBeWi]

Clear when? Assigning temporary metadata is prone to getting it saved accidentally.
(on a side note, it would be nice if we had a way to add metadata that isn't saved, like with a special prefix)

[adamscott]

I would name it for what it does.

Suggested change

	void set_temporary_path(const String &p_path);
	void set_path_cache(const String &p_path);

[akien-mga]

Seems relatively safe. Let's merge and test it in the next beta.

[akien-mga]

Thanks!

[nikitalita]

@KoBeWi shouldn't it be here, too?
https://github.com/KoBeWi/godot/blob/a3627b6e37049ca55cc0d5227a4ff7bc1b19ae1e/scene/resources/resource_format_text.cpp#L713

And here:
https://github.com/KoBeWi/godot/blob/a3627b6e37049ca55cc0d5227a4ff7bc1b19ae1e/scene/resources/resource_format_text.cpp#L801

[KoBeWi]

Well, that code isn't known to cause problems, so it wasn't necessary. This solution is basically a hack, so it should be used only where relevant.

[nikitalita]

Given your current fix, I'm not really sure why those instances above wouldn't cause problems. Right now, you're assigning the path_cache to both the internal resources and the main resource in resource_format_binary, but in resource_format_text, you're only assigning the path_cache to the internal resources. Unless you intended to only assign the path_cache to the internal resources in resource_format_binary?

[KoBeWi]

Right now, you're assigning the path_cache to both the internal resources and the main resource in resource_format_binary

I'm not, the code I added for both is the same.
The bug affects only internal resources.