### Godot version

4.0 beta 15

### System information

Windows 10

### Issue description

It happened with both Google IME and MS-IME, and there was no problem until Beta14.
When typing Japanese characters, it is common to select a character from the suggestion window and then start typing the next character before confirming.
In this case, uncommitted characters are forcibly committed, and input of the next character begins.

**↓Beta15**

https://user-images.githubusercontent.com/186786/214753450-b493cca6-2644-4b3d-8cd2-660565cc3547.mp4

**↓Beta14**

https://user-images.githubusercontent.com/186786/214755127-dde819cc-4d63-403a-99b0-09821671f74e.mp4



### Steps to reproduce

It happened with both Google IME and MS-IME in beta15

### Minimal reproduction project

It is project independent and happens in the editor.
String t;
					if (get_caret_column(i) >= 0) {
						t = text[get_caret_line(i)].substr(0, get_caret_column(i)) + ime_text + text[get_caret_line(i)].substr(get_caret_column(i), text[get_caret_line(i)].length());
					} else {
						t = ime_text;
					}
					text.invalidate_cache(get_caret_line(i), get_caret_column(i), true, t, structured_text_parser(st_parser, st_args, t));
				}
				queue_redraw();
			}
		} break;
		case NOTIFICATION_DRAG_BEGIN: {
			selecting_mode = SelectionMode::SELECTION_MODE_NONE;
			drag_action = true;
			dragging_minimap = false;
			dragging_selection = false;
			can_drag_minimap = false;
			click_select_held->stop();
		} break;
		case NOTIFICATION_DRAG_END: {
			if (is_drag_successful()) {
				if (selection_drag_attempt) {
					selection_drag_attempt = false;
					if (is_editable() && !Input::get_singleton()->is_key_pressed(Key::CTRL)) {
						delete_selection();
					} else if (deselect_on_focus_loss_enabled) {
						deselect();
					}
				}
			} else {