### 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.
switch (p_what) {
#ifdef TOOLS_ENABLED
		case NOTIFICATION_ENTER_TREE: {
			if (Engine::get_singleton()->is_editor_hint() && !get_tree()->is_node_being_edited(this)) {
				set_caret_blink_enabled(EDITOR_GET("text_editor/appearance/caret/caret_blink"));
				set_caret_blink_interval(EDITOR_GET("text_editor/appearance/caret/caret_blink_interval"));
				if (!EditorSettings::get_singleton()->is_connected("settings_changed", callable_mp(this, &LineEdit::_editor_settings_changed))) {
					EditorSettings::get_singleton()->connect("settings_changed", callable_mp(this, &LineEdit::_editor_settings_changed));
				}
			}
		} break;
#endif