### 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.
}
			}
			int top_limit_y = 0;
			int bottom_limit_y = get_size().height;
			if (!editable) {
				top_limit_y += style_readonly->get_margin(SIDE_TOP);
				bottom_limit_y -= style_readonly->get_margin(SIDE_BOTTOM);
			} else {
				top_limit_y += style_normal->get_margin(SIDE_TOP);
				bottom_limit_y -= style_normal->get_margin(SIDE_BOTTOM);
			}
			
			line_drawing_cache.clear();
			int row_height = draw_placeholder ? placeholder_line_height + line_spacing : get_line_height();
			int line = first_vis_line;
			for (int i = 0; i < draw_amount; i++) {
				line++;
				if (line < 0 || line >= (int)text.size()) {
					continue;
				}
				while (_is_line_hidden(line)) {
					line++;
					if (line < 0 || line >= (int)text.size()) {
						break;
					}
				}
				if (line < 0 || line >= (int)text.size()) {
					continue;
				}
				LineDrawingCache cache_entry;