### 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.
}
								{
									
									Vector<Vector2> sel = TS->shaped_text_get_selection(rid, get_caret_column(c) + ime_selection.x, get_caret_column(c) + ime_selection.x + ime_selection.y);
									for (int j = 0; j < sel.size(); j++) {
										Rect2 rect = Rect2(sel[j].x + char_margin + ofs_x, ofs_y, sel[j].y - sel[j].x, text_height);
										if (rect.position.x + rect.size.x <= xmargin_beg || rect.position.x > xmargin_end) {
											continue;
										}
										if (rect.position.x < xmargin_beg) {
											rect.size.x -= (xmargin_beg - rect.position.x);
											rect.position.x = xmargin_beg;
										} else if (rect.position.x + rect.size.x > xmargin_end) {
											rect.size.x = xmargin_end - rect.position.x;
										}
										rect.size.y = caret_width * 3;
										draw_rect(rect, caret_color);
										carets.write[c].draw_pos.x = rect.position.x;
									}
								}
							}
						}
					}
				}
				if (!draw_placeholder) {
					line_drawing_cache[line] = cache_entry;
				}
			}
			if (has_focus()) {
				if (get_viewport()->get_window_id() != DisplayServer::INVALID_WINDOW_ID && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_IME)) {