### 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.
if (!selecting_enabled) {
		return;
	}
	if (!has_selection(p_caret) || get_selection_mode() == SelectionMode::SELECTION_MODE_NONE) {
		carets.write[p_caret].selection.active = true;
		set_selection_mode(SelectionMode::SELECTION_MODE_SHIFT, get_caret_line(p_caret), get_caret_column(p_caret), p_caret);
		return;
	}
	set_selection_mode(SelectionMode::SELECTION_MODE_SHIFT, get_selection_line(p_caret), get_selection_column(p_caret), p_caret);
}
void TextEdit::_post_shift_selection(int p_caret) {
	if (!selecting_enabled) {
		return;
	}
	if (has_selection(p_caret) && get_selection_mode() == SelectionMode::SELECTION_MODE_SHIFT) {
		select(get_selection_line(p_caret), get_selection_column(p_caret), get_caret_line(p_caret), get_caret_column(p_caret), p_caret);
	}
}
void TextEdit::_update_wrap_at_column(bool p_force) {