### 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.
} break;
		case NOTIFICATION_INTERNAL_PROCESS: {
			if (caret_blink_enabled && caret_can_draw) {
				caret_blink_timer += get_process_delta_time();
				if (caret_blink_timer >= caret_blink_interval) {
					caret_blink_timer = 0.0;
					_toggle_draw_caret();
				}
			}
		} break;
		case NOTIFICATION_DRAW: {
			int width, height;
			bool rtl = is_layout_rtl();
			Size2 size = get_size();
			width = size.width;
			height = size.height;
			RID ci = get_canvas_item();
			Ref<StyleBox> style = theme_cache.normal;
			if (!is_editable()) {
				style = theme_cache.read_only;
			}
			Ref<Font> font = theme_cache.font;
			if (!flat) {
				style->draw(ci, Rect2(Point2(), size));
			}
			if (has_focus()) {
				theme_cache.focus->draw(ci, Rect2(Point2(), size));
			}
			int x_ofs = 0;
			bool using_placeholder = text.is_empty() && ime_text.is_empty();