### 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.
dragging_selection = true;
	Point2 mp = get_local_mouse_pos();
	Point2i pos = get_line_column_at_pos(mp);
	int line = pos.y;
	int col = pos.x;
	int caret_idx = carets.size() - 1;
	col = 0;
	if (line < carets[caret_idx].selection.selecting_line) {
		
		set_caret_line(line - 1, false, true, 0, caret_idx);
		carets.write[caret_idx].selection.selecting_column = text[get_selection_line(caret_idx)].length();
	} else {
		
		set_caret_line(line + 1, false, true, 0, caret_idx);
		carets.write[caret_idx].selection.selecting_column = 0;
		col = text[line].length();
	}
	set_caret_column(0, false, caret_idx);
	select(carets[caret_idx].selection.selecting_line, carets[caret_idx].selection.selecting_column, line, col, caret_idx);
	if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
		DisplayServer::get_singleton()->clipboard_set_primary(get_selected_text());
	}
	queue_redraw();
	click_select_held->start();
	merge_overlapping_carets();
}
void TextEdit::_pre_shift_selection(int p_caret) {