### Godot version

4.0 beta 10

### System information

Windows 11 Vulkan

### Issue description

Looked through the issues list, but couldn't find something like this, sorry in advance if this has already been reported.

There is a few cases (in the pictures below) where list of Actions in Input Map may not always show a scrollbar even if the actions list overflows (I imagine this could also happen for the widget that Input Map uses).

![image](https://user-images.githubusercontent.com/39958198/210003566-cf60dbaf-921f-485b-b0a9-51ffc28d0244.png)

![New Bitmap image](https://user-images.githubusercontent.com/39958198/210004079-8eb2e6a1-0cf5-4a7c-8905-a4e3cfd0ec5d.png)

![image](https://user-images.githubusercontent.com/39958198/210004165-a6b6790b-248a-4f68-b4d0-b44b25afdf4f.png)

![image](https://user-images.githubusercontent.com/39958198/210004537-aca52194-a464-48b9-b818-24782706de45.png)


### Steps to reproduce

The pictures are clearer than anything I could write here: "a picture is worth 1000 words"

### Minimal reproduction project

N/A
}
	}
}
bool Tree::edit_selected() {
	TreeItem *s = get_selected();
	ERR_FAIL_COND_V_MSG(!s, false, "No item selected.");
	ensure_cursor_is_visible();
	int col = get_selected_column();
	ERR_FAIL_INDEX_V_MSG(col, columns.size(), false, "No item column selected.");
	if (!s->cells[col].editable) {
		return false;
	}
	Rect2 rect = s->get_meta("__focus_rect");
	popup_edited_item = s;
	popup_edited_item_col = col;
	const TreeItem::Cell &c = s->cells[col];
	if (c.mode == TreeItem::CELL_MODE_CHECK) {
		s->set_checked(col, !c.checked);
		item_edited(col, s);
		return true;
	} else if (c.mode == TreeItem::CELL_MODE_CUSTOM) {
		edited_item = s;
		edited_col = col;
		custom_popup_rect = Rect2i(get_global_position() + rect.position, rect.size);
		emit_signal(SNAME("custom_popup_edited"), false);
		item_edited(col, s);
		return true;
	} else if (c.mode == TreeItem::CELL_MODE_RANGE && !c.text.is_empty()) {
		popup_menu->clear();
		for (int i = 0; i < c.text.get_slice_count(","); i++) {