### 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
}
		if (!p_item->disable_folding && !hide_folding && !p_item->cells[col].editable && !p_item->cells[col].selectable && p_item->get_first_child()) {
			if (enable_recursive_folding && p_mod->is_shift_pressed()) {
				p_item->set_collapsed_recursive(!p_item->is_collapsed());
			} else {
				p_item->set_collapsed(!p_item->is_collapsed());
			}
			return -1; 
		}
		const TreeItem::Cell &c = p_item->cells[col];
		bool already_selected = c.selected;
		bool already_cursor = (p_item == selected_item) && col == selected_col;
		if (!cache.rtl && p_item->cells[col].buttons.size()) {
			int button_w = 0;
			for (int j = p_item->cells[col].buttons.size() - 1; j >= 0; j--) {
				Ref<Texture2D> b = p_item->cells[col].buttons[j].texture;
				button_w += b->get_size().width + theme_cache.button_pressed->get_minimum_size().width + theme_cache.button_margin;
			}
			col_width = MAX(button_w, MIN(limit_w, col_width));
		}
		for (int j = c.buttons.size() - 1; j >= 0; j--) {
			Ref<Texture2D> b = c.buttons[j].texture;
			int w = b->get_size().width + theme_cache.button_pressed->get_minimum_size().width;
			if (x > col_width - w) {
				if (c.buttons[j].disabled) {
					pressed_button = -1;
					cache.click_type = Cache::CLICK_NONE;
					return -1;
				}