### Godot version

4.0.dev(0810ecaafdbee3ea747219e6ab3a8de5d2216a09)

### System information

any

### Issue description

https://user-images.githubusercontent.com/61938263/215898051-8506b45e-a9d4-4c3f-b1b3-28f202dea67b.mp4



### Steps to reproduce

Editt AnimationBlendTree

### Minimal reproduction project

N/A
switch (p_operation) {
		case GraphEdit::IS_EQUAL: {
			for (const StringName &E : r_u) {
				if (!r_v.has(E)) {
					return 0;
				}
			}
			return r_u.size() == r_v.size();
		} break;
		case GraphEdit::IS_SUBSET: {
			if (r_u.size() == r_v.size() && !r_u.size()) {
				return 1;
			}
			for (const StringName &E : r_u) {
				if (!r_v.has(E)) {
					return 0;
				}
			}
			return 1;
		} break;
		case GraphEdit::DIFFERENCE: {
			for (HashSet<StringName>::Iterator E = r_u.begin(); E;) {
				HashSet<StringName>::Iterator N = E;
				++N;
				if (r_v.has(*E)) {
					r_u.remove(E);
				}
				E = N;
			}