### 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.
next_line = get_caret_line(caret_idx);
			
			for (int j = i - 1; j >= 0; j--) {
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				carets_to_remove.push_back(caret_edit_order[j]);
			}
		} else if (p_word && get_caret_column(caret_idx) < curline_len - 1) {
			
			int line = get_caret_line(caret_idx);
			int column = get_caret_column(caret_idx);
			PackedInt32Array words = TS->shaped_text_get_word_breaks(text.get_line_data(line)->get_rid());
			for (int j = 1; j < words.size(); j = j + 2) {
				if (words[j] > column) {
					column = words[j];
					break;
				}
			}
			next_line = line;
			next_column = column;
			
			for (int j = i - 1; j >= 0; j--) {
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				if (get_caret_column(caret_edit_order[j]) > column) {
					break;
				}
				carets_to_remove.push_back(caret_edit_order[j]);