### 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.
select();
				accept_event();
				return;
			}
			
			if (k->is_action("ui_cut", true)) {
				cut_text();
				accept_event();
				return;
			}
			if (k->is_action("ui_paste", true)) {
				paste_text();
				accept_event();
				return;
			}
			
			if (k->is_action("ui_undo", true)) {
				undo();
				accept_event();
				return;
			}
			if (k->is_action("ui_redo", true)) {
				redo();
				accept_event();
				return;
			}
		}
		
		if (k->is_action("ui_text_backspace_all_to_left", true)) {
			_backspace(false, true);