### 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.
op.from_column = p_from_column;
	op.to_line = p_to_line;
	op.to_column = p_to_column;
	op.text = txt;
	op.version = ++version;
	op.chain_forward = false;
	op.chain_backward = false;
	op.start_carets = carets;
	op.end_carets = carets;
	
	if (current_op.type != op.type) {
		op.prev_version = get_version();
		_push_current_op();
		current_op = op;
		return; 
	}
	
	if (current_op.from_line == p_to_line && current_op.from_column == p_to_column) {
		
		current_op.text = txt + current_op.text;
		current_op.from_line = p_from_line;
		current_op.from_column = p_from_column;
		current_op.end_carets = carets;
		return; 
	}
	op.prev_version = get_version();
	_push_current_op();
	current_op = op;
}
void TextEdit::_base_insert_text(int p_line, int p_char, const String &p_text, int &r_end_line, int &r_end_column) {