### 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.
ts_caret.l_caret.size.y = caret_width;
												}
												if (ts_caret.l_caret.position.x >= TS->shaped_text_get_size(rid).x) {
													ts_caret.l_caret.size.x = font->get_char_size('m', font_size).x;
												} else {
													ts_caret.l_caret.size.x = 3 * caret_width;
												}
												ts_caret.l_caret.position += Vector2(char_margin + ofs_x, ofs_y);
												if (ts_caret.l_dir == TextServer::DIRECTION_RTL) {
													ts_caret.l_caret.position.x -= ts_caret.l_caret.size.x;
												}
												draw_rect(ts_caret.l_caret, caret_color, overtype_mode);
											}
										} else {
											
											if (ts_caret.l_caret != Rect2() && ts_caret.l_dir == TextServer::DIRECTION_AUTO) {
												
												Rect2 trect = Rect2(ts_caret.l_caret.position.x - 2.5 * caret_width, ts_caret.l_caret.position.y, 6 * caret_width, caret_width);
												trect.position += Vector2(char_margin + ofs_x, ofs_y);
												RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);
											} else if (ts_caret.l_caret != Rect2() && ts_caret.t_caret != Rect2() && ts_caret.l_dir != ts_caret.t_dir) {
												
												float d = (ts_caret.l_dir == TextServer::DIRECTION_LTR) ? 0.5 : -3;
												Rect2 trect = Rect2(ts_caret.l_caret.position.x + d * caret_width, ts_caret.l_caret.position.y + ts_caret.l_caret.size.y - caret_width, 3 * caret_width, caret_width);
												trect.position += Vector2(char_margin + ofs_x, ofs_y);
												RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);
												d = (ts_caret.t_dir == TextServer::DIRECTION_LTR) ? 0.5 : -3;
												trect = Rect2(ts_caret.t_caret.position.x + d * caret_width, ts_caret.t_caret.position.y, 3 * caret_width, caret_width);
												trect.position += Vector2(char_margin + ofs_x, ofs_y);
												RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);