### 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.
mm->set_tilt(Vector2((float)pen_info.tiltX / 90, (float)pen_info.tiltY / 90));
			}
			mm->set_pen_inverted(pen_info.penFlags & (PEN_FLAG_INVERTED | PEN_FLAG_ERASER));
			mm->set_ctrl_pressed(GetKeyState(VK_CONTROL) < 0);
			mm->set_shift_pressed(GetKeyState(VK_SHIFT) < 0);
			mm->set_alt_pressed(alt_mem);
			mm->set_button_mask(last_button_state);
			POINT coords; 
			coords.x = GET_X_LPARAM(lParam);
			coords.y = GET_Y_LPARAM(lParam);
			ScreenToClient(windows[window_id].hWnd, &coords);
			mm->set_position(Vector2(coords.x, coords.y));
			mm->set_global_position(Vector2(coords.x, coords.y));
			if (mouse_mode == MOUSE_MODE_CAPTURED) {
				Point2i c(windows[window_id].width / 2, windows[window_id].height / 2);
				old_x = c.x;
				old_y = c.y;
				if (mm->get_position() == c) {
					center = c;
					return 0;
				}
				Point2i ncenter = mm->get_position();
				center = ncenter;
				POINT pos = { (int)c.x, (int)c.y };
				ClientToScreen(hWnd, &pos);
				SetCursorPos(pos.x, pos.y);
			}
			mm->set_velocity(Input::get_singleton()->get_last_mouse_velocity());
			if (old_invalid) {
				old_x = mm->get_position().x;