### 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.
} break;
						}
						RenderingServer::get_singleton()->canvas_item_add_rect(ci, caret.l_caret, caret_color);
					} else {
						if (caret.l_caret != Rect2() && caret.l_dir == TextServer::DIRECTION_AUTO) {
							
							Rect2 trect = Rect2(caret.l_caret.position.x - 2.5 * caret_width, caret.l_caret.position.y, 6 * caret_width, caret_width);
							trect.position += ofs;
							RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);
						} else if (caret.l_caret != Rect2() && caret.t_caret != Rect2() && caret.l_dir != caret.t_dir) {
							
							float d = (caret.l_dir == TextServer::DIRECTION_LTR) ? 0.5 : -3;
							Rect2 trect = Rect2(caret.l_caret.position.x + d * caret_width, caret.l_caret.position.y + caret.l_caret.size.y - caret_width, 3 * caret_width, caret_width);
							trect.position += ofs;
							RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);
							d = (caret.t_dir == TextServer::DIRECTION_LTR) ? 0.5 : -3;
							trect = Rect2(caret.t_caret.position.x + d * caret_width, caret.t_caret.position.y, 3 * caret_width, caret_width);
							trect.position += ofs;
							RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);
						}
						caret.l_caret.position += ofs;
						caret.l_caret.size.x = caret_width;
						RenderingServer::get_singleton()->canvas_item_add_rect(ci, caret.l_caret, caret_color);
						caret.t_caret.position += ofs;
						caret.t_caret.size.x = caret_width;
						RenderingServer::get_singleton()->canvas_item_add_rect(ci, caret.t_caret, caret_color);
					}
				}
				if (!ime_text.is_empty()) {
					{