### 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.
return selecting_mode;
}
void TextEdit::select_all() {
	if (!selecting_enabled) {
		return;
	}
	if (text.size() == 1 && text[0].length() == 0) {
		return;
	}
	remove_secondary_carets();
	select(0, 0, text.size() - 1, text[text.size() - 1].length());
	set_selection_mode(SelectionMode::SELECTION_MODE_SHIFT, 0, 0);
	carets.write[0].selection.shiftclick_left = true;
	set_caret_line(get_selection_to_line(), false);
	set_caret_column(get_selection_to_column(), false);
	queue_redraw();
}
void TextEdit::select_word_under_caret(int p_caret) {
	ERR_FAIL_COND(p_caret > carets.size());
	if (!selecting_enabled) {
		return;
	}
	if (text.size() == 1 && text[0].length() == 0) {
		return;
	}
	for (int c = 0; c < carets.size(); c++) {
		if (p_caret != -1 && p_caret != c) {