### 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 ((caret_column < selection.begin) || (caret_column > selection.end) || !selection.enabled) {
					deselect();
					selection.start_column = caret_column;
					selection.creating = true;
				} else if (selection.enabled && !selection.double_click) {
					selection.drag_attempt = true;
				}
			}
			queue_redraw();
		} else {
			if (selection.enabled && !pass && b->get_button_index() == MouseButton::LEFT && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
				DisplayServer::get_singleton()->clipboard_set_primary(text.substr(selection.begin, selection.end - selection.begin));
			}
			if (!text.is_empty() && is_editable() && clear_button_enabled) {
				bool press_attempt = clear_button_status.press_attempt;
				clear_button_status.press_attempt = false;
				if (press_attempt && clear_button_status.pressing_inside && _is_over_clear_button(b->get_position())) {
					clear();
					return;
				}
			}
			if ((!selection.creating) && (!selection.double_click)) {
				deselect();
			}
			selection.creating = false;
			selection.double_click = false;
			if (!drag_action) {
				selection.drag_attempt = false;
			}
			if (pending_select_all_on_focus) {