### 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.
r_style = 0;
	r_style_ex = WS_EX_WINDOWEDGE;
	if (p_main_window) {
		r_style_ex |= WS_EX_APPWINDOW;
		r_style |= WS_VISIBLE;
	}
	if (p_fullscreen || p_borderless) {
		r_style |= WS_POPUP; 
		if (p_fullscreen && p_multiwindow_fs) {
			r_style |= WS_BORDER; 
		}
	} else {
		if (p_resizable) {
			if (p_maximized) {
				r_style = WS_OVERLAPPEDWINDOW | WS_MAXIMIZE;
			} else {
				r_style = WS_OVERLAPPEDWINDOW;
			}
		} else {
			r_style = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU;
		}