`"%+f" % -0.0` evaluates to `"+-0.000000"` instead of `"-0.000000"`

[mieldepoche]

Godot version

4.1.1

System information

linux

Issue description

The "%+f" format adds a + sign in front of positive numbers. If you try to format -0.0, it breaks and displays both a + and a -.

Steps to reproduce

@tool
extends EditorScript

func _run() -> void:
    print("%+f" % -0.0)

Minimal reproduction project

see above

[dalexeev]

If you want to find the cause of the bug, you should start looking here:

godot/core/string/ustring.cpp

Lines 4893 to 4894 in 75de1ca

	bool is_negative = (value < 0);
	String str = String::num(ABS(value), min_decimals);

godot/core/string/ustring.cpp

Lines 4914 to 4921 in 75de1ca

	if (show_sign || is_negative) {
	String sign_char = is_negative ? "-" : "+";
	if (left_justified) {
	str = str.insert(0, sign_char);
	} else {
	str = str.insert(pad_with_zeros ? 0 : str.length() - initial_len, sign_char);
	}
	}