### Godot version

v4.1.beta.custom_build [d3651ea45]

### System information

Windows 11

### Issue description

![1](https://github.com/godotengine/godot/assets/28705694/15c14c93-7ad7-425a-8fb0-bef841b75527)

It's not possible to start text selection on a SpinBox when it's unfocused.

Note: After a bit of digging in the code, I found that clicking on a SpintBox doesn't trigger `SpinBox::gui_input` no matter if it's focused or not. However, releasing mouse left button does trigger the function.

### Steps to reproduce

See the gif.

### Minimal reproduction project

It's simple to reproduce.
if (!editable) {
		return;
	}
	if (p_all_to_right) {
		deselect();
		text = text.substr(caret_column, text.length() - caret_column);
		_shape();
		set_caret_column(0);
		_text_changed();
		return;
	}
	if (selection.enabled) {