### 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.
}
				ofs_max -= r_icon->get_width();
			}
			
			Vector2 ofs = Point2(x_ofs + scroll_offset, y_ofs);
			if (selection.enabled) {
				Vector<Vector2> sel = TS->shaped_text_get_selection(text_rid, selection.begin, selection.end);
				for (int i = 0; i < sel.size(); i++) {
					Rect2 rect = Rect2(sel[i].x + ofs.x, ofs.y, sel[i].y - sel[i].x, text_height);
					if (rect.position.x + rect.size.x <= x_ofs || rect.position.x > ofs_max) {
						continue;
					}
					if (rect.position.x < x_ofs) {
						rect.size.x -= (x_ofs - rect.position.x);
						rect.position.x = x_ofs;
					} else if (rect.position.x + rect.size.x > ofs_max) {
						rect.size.x = ofs_max - rect.position.x;
					}
					RenderingServer::get_singleton()->canvas_item_add_rect(ci, rect, selection_color);
				}
			}
			const Glyph *glyphs = TS->shaped_text_get_glyphs(text_rid);
			int gl_size = TS->shaped_text_get_glyph_count(text_rid);
			
			ofs.y += TS->shaped_text_get_ascent(text_rid);
			Color font_outline_color = theme_cache.font_outline_color;
			int outline_size = theme_cache.font_outline_size;
			if (outline_size > 0 && font_outline_color.a > 0) {
				Vector2 oofs = ofs;
				for (int i = 0; i < gl_size; i++) {