### 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.
} else if (cc == c) {
										stack++;
									} else if (cc == closec) {
										stack--;
									}
									if (stack == 0) {
										brace_matching.write[caret].close_match_line = i;
										brace_matching.write[caret].close_match_column = j;
										brace_matching.write[caret].close_matching = true;
										break;
									}
								}
								if (brace_matching.write[caret].close_match_line != -1) {
									break;
								}
							}
							if (!brace_matching.write[caret].close_matching) {
								brace_matching.write[caret].close_mismatch = true;
							}
						}
					}
				}
			}
			bool draw_placeholder = text.size() == 1 && text[0].is_empty() && ime_text.is_empty();
			
			String highlighted_text = get_selected_text(0);
			
			bool only_whitespaces_highlighted = highlighted_text.strip_edges().is_empty();
			HashMap<int, HashSet<int>> caret_line_wrap_index_map;
			Vector<int> carets_wrap_index;