### 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.
menu_ctl->add_item(RTR("Start of Left-to-Right Embedding (LRE)"), MENU_INSERT_LRE);
		menu_ctl->add_item(RTR("Start of Right-to-Left Embedding (RLE)"), MENU_INSERT_RLE);
		menu_ctl->add_item(RTR("Start of Left-to-Right Override (LRO)"), MENU_INSERT_LRO);
		menu_ctl->add_item(RTR("Start of Right-to-Left Override (RLO)"), MENU_INSERT_RLO);
		menu_ctl->add_item(RTR("Pop Direction Formatting (PDF)"), MENU_INSERT_PDF);
		menu_ctl->add_separator();
		menu_ctl->add_item(RTR("Arabic Letter Mark (ALM)"), MENU_INSERT_ALM);
		menu_ctl->add_item(RTR("Left-to-Right Isolate (LRI)"), MENU_INSERT_LRI);
		menu_ctl->add_item(RTR("Right-to-Left Isolate (RLI)"), MENU_INSERT_RLI);
		menu_ctl->add_item(RTR("First Strong Isolate (FSI)"), MENU_INSERT_FSI);
		menu_ctl->add_item(RTR("Pop Direction Isolate (PDI)"), MENU_INSERT_PDI);
		menu_ctl->add_separator();
		menu_ctl->add_item(RTR("Zero-Width Joiner (ZWJ)"), MENU_INSERT_ZWJ);
		menu_ctl->add_item(RTR("Zero-Width Non-Joiner (ZWNJ)"), MENU_INSERT_ZWNJ);
		menu_ctl->add_item(RTR("Word Joiner (WJ)"), MENU_INSERT_WJ);
		menu_ctl->add_item(RTR("Soft Hyphen (SHY)"), MENU_INSERT_SHY);
		menu->add_child(menu_ctl, false, INTERNAL_MODE_FRONT);
		menu->connect("id_pressed", callable_mp(this, &TextEdit::menu_option));
		menu_dir->connect("id_pressed", callable_mp(this, &TextEdit::menu_option));
		menu_ctl->connect("id_pressed", callable_mp(this, &TextEdit::menu_option));
	}
	
	menu->clear();
	if (editable) {
		menu->add_item(RTR("Cut"), MENU_CUT, is_shortcut_keys_enabled() ? _get_menu_action_accelerator("ui_cut") : Key::NONE);
	}
	menu->add_item(RTR("Copy"), MENU_COPY, is_shortcut_keys_enabled() ? _get_menu_action_accelerator("ui_copy") : Key::NONE);
	if (editable) {
		menu->add_item(RTR("Paste"), MENU_PASTE, is_shortcut_keys_enabled() ? _get_menu_action_accelerator("ui_paste") : Key::NONE);
	}