### 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.
_reset_caret_blink_timer();
		if (b->is_pressed()) {
			accept_event(); 
			if (!text.is_empty() && is_editable() && _is_over_clear_button(b->get_position())) {
				clear_button_status.press_attempt = true;
				clear_button_status.pressing_inside = true;
				queue_redraw();
				return;
			}
			if (b->is_shift_pressed()) {
				shift_selection_check_pre(true);
			}
			set_caret_at_pixel_pos(b->get_position().x);
			if (b->is_shift_pressed()) {
				selection_fill_at_caret();
				selection.creating = true;
			} else {
				if (selecting_enabled) {
					const int triple_click_timeout = 600;
					const int triple_click_tolerance = 5;
					const bool is_triple_click = !b->is_double_click() && (OS::get_singleton()->get_ticks_msec() - last_dblclk) < triple_click_timeout && b->get_position().distance_to(last_dblclk_pos) < triple_click_tolerance;
					if (is_triple_click && text.length()) {
						
						selection.enabled = true;
						selection.begin = 0;
						selection.end = text.length();
						selection.double_click = true;
						last_dblclk = 0;
						set_caret_column(selection.begin);
						if (!pass && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {