### 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.
bool is_match = true;
			if (pos != -1 && (p_search_flags & SEARCH_WHOLE_WORDS)) {
				
				if (pos > 0 && !is_symbol(text_line[pos - 1])) {
					is_match = false;
				} else if (pos + p_key.length() < text_line.length() && !is_symbol(text_line[pos + p_key.length()])) {
					is_match = false;
				}
			}
			if (pos_from == -1) {
				pos = -1;
			}
			if (is_match || last_pos == -1 || pos == -1) {
				break;
			}
			pos_from = (p_search_flags & SEARCH_BACKWARDS) ? pos - 1 : pos + 1;
			pos = -1;
		}
		if (pos != -1) {
			break;
		}
		if (p_search_flags & SEARCH_BACKWARDS) {
			line--;
		} else {
			line++;
		}
	}
	return (pos == -1) ? Point2i(-1, -1) : Point2i(pos, line);
}
Point2 TextEdit::get_local_mouse_pos() const {