### 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
force_edit_checkbox_only_on_checkbox = p_enable;
}
bool Tree::get_edit_checkbox_cell_only_when_checkbox_is_pressed() const {
	return force_edit_checkbox_only_on_checkbox;
}
void Tree::set_allow_rmb_select(bool p_allow) {
	allow_rmb_select = p_allow;
}
bool Tree::get_allow_rmb_select() const {
	return allow_rmb_select;
}
void Tree::set_allow_reselect(bool p_allow) {
	allow_reselect = p_allow;
}
bool Tree::get_allow_reselect() const {
	return allow_reselect;
}
void Tree::_bind_methods() {
	ClassDB::bind_method(D_METHOD("clear"), &Tree::clear);
	ClassDB::bind_method(D_METHOD("create_item", "parent", "idx"), &Tree::create_item, DEFVAL(Variant()), DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("get_root"), &Tree::get_root);
	ClassDB::bind_method(D_METHOD("set_column_custom_minimum_width", "column", "min_width"), &Tree::set_column_custom_minimum_width);
	ClassDB::bind_method(D_METHOD("set_column_expand", "column", "expand"), &Tree::set_column_expand);
	ClassDB::bind_method(D_METHOD("set_column_expand_ratio", "column", "ratio"), &Tree::set_column_expand_ratio);
	ClassDB::bind_method(D_METHOD("set_column_clip_content", "column", "enable"), &Tree::set_column_clip_content);
	ClassDB::bind_method(D_METHOD("is_column_expanding", "column"), &Tree::is_column_expanding);
	ClassDB::bind_method(D_METHOD("is_column_clipping_content", "column"), &Tree::is_column_clipping_content);
	ClassDB::bind_method(D_METHOD("get_column_expand_ratio", "column"), &Tree::get_column_expand_ratio);
	ClassDB::bind_method(D_METHOD("get_column_width", "column"), &Tree::get_column_width);
	ClassDB::bind_method(D_METHOD("set_hide_root", "enable"), &Tree::set_hide_root);