### Godot version

4.0.3

### System information

Win7

### Issue description

![image](https://github.com/godotengine/godot/assets/28286958/abec9d3c-e078-424c-9430-d9fe8897aad6)


### Steps to reproduce

1. Create shader
2. Add uint with hex, e.g. 0xffffu

### Minimal reproduction project

N/A
if (!arg_name.is_empty()) {
							calltip += " ";
							calltip += arg_name;
						}
						if (i == completion_argument) {
							calltip += char32_t(0xFFFF);
						}
						found_arg = true;
					}
					if (found_arg) {
						calltip += " ";
					}
					calltip += ")";
				}
				idx++;
			}
			r_call_hint = calltip;
			return OK;
		} break;
		case COMPLETION_INDEX: {
			const char colv[4] = { 'r', 'g', 'b', 'a' };
			const char coordv[4] = { 'x', 'y', 'z', 'w' };
			const char coordt[4] = { 's', 't', 'p', 'q' };
			int limit = 0;
			switch (completion_base) {
				case TYPE_BVEC2:
				case TYPE_IVEC2:
				case TYPE_UVEC2:
				case TYPE_VEC2: {
					limit = 2;