### 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.
if (k->is_action("ui_text_caret_up", true)) {
			_move_caret_up(shift_pressed);
			accept_event();
			return;
		}
		if (k->is_action("ui_text_caret_down", true)) {
			_move_caret_down(shift_pressed);
			accept_event();
			return;
		}
		
		if (k->is_action("ui_text_caret_document_start", true)) { 
			_move_caret_document_start(shift_pressed);
			accept_event();
			return;
		}
		if (k->is_action("ui_text_caret_document_end", true)) { 
			_move_caret_document_end(shift_pressed);
			accept_event();
			return;
		}
		
		if (k->is_action("ui_text_caret_line_start", true)) {
			_move_caret_to_line_start(shift_pressed);
			accept_event();
			return;
		}
		if (k->is_action("ui_text_caret_line_end", true)) {
			_move_caret_to_line_end(shift_pressed);
			accept_event();