### 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.
Color font_color;
			if (is_editable()) {
				font_color = theme_cache.font_color;
			} else {
				font_color = theme_cache.font_uneditable_color;
			}
			Color font_selected_color = theme_cache.font_selected_color;
			Color caret_color = theme_cache.caret_color;
			
			if (using_placeholder) {
				font_color = theme_cache.font_placeholder_color;
			}
			bool display_clear_icon = !using_placeholder && is_editable() && clear_button_enabled;
			if (right_icon.is_valid() || display_clear_icon) {
				Ref<Texture2D> r_icon = display_clear_icon ? theme_cache.clear_icon : right_icon;
				Color color_icon(1, 1, 1, !is_editable() ? .5 * .9 : .9);
				if (display_clear_icon) {
					if (clear_button_status.press_attempt && clear_button_status.pressing_inside) {
						color_icon = theme_cache.clear_button_color_pressed;
					} else {
						color_icon = theme_cache.clear_button_color;
					}
				}
				r_icon->draw(ci, Point2(width - r_icon->get_width() - style->get_margin(SIDE_RIGHT), height / 2 - r_icon->get_height() / 2), color_icon);
				if (alignment == HORIZONTAL_ALIGNMENT_CENTER) {
					if (Math::is_zero_approx(scroll_offset)) {
						x_ofs = MAX(style->get_margin(SIDE_LEFT), int(size.width - text_width - r_icon->get_width() - style->get_margin(SIDE_RIGHT) * 2) / 2);
					}
				} else {
					x_ofs = MAX(style->get_margin(SIDE_LEFT), x_ofs - r_icon->get_width() - style->get_margin(SIDE_RIGHT));