### 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
draw_pos.y += Math::floor((rect.size.y - p_cell.text_buf->get_size().y) / 2.0);
		p_cell.text_buf->set_width(MAX(0, rect.size.width));
		if (p_ol_size > 0 && p_ol_color.a > 0) {
			p_cell.text_buf->draw_outline(ci, draw_pos, p_ol_size, p_ol_color);
		}
		p_cell.text_buf->draw(ci, draw_pos, p_color);
		rect.position.x += ts.width + theme_cache.h_separation;
		rect.size.x -= ts.width + theme_cache.h_separation;
	}
	if (!p_cell.icon.is_null()) {
		Size2i bmsize = p_cell.get_icon_size();
		if (p_cell.icon_max_w > 0 && bmsize.width > p_cell.icon_max_w) {
			bmsize.height = bmsize.height * p_cell.icon_max_w / bmsize.width;
			bmsize.width = p_cell.icon_max_w;
		}
		p_cell.draw_icon(ci, rect.position + Size2i(0, Math::floor((real_t)(rect.size.y - bmsize.y) / 2)), bmsize, p_icon_color);
		rect.position.x += bmsize.x + theme_cache.h_separation;
		rect.size.x -= bmsize.x + theme_cache.h_separation;
	}
	if (!rtl) {
		Point2 draw_pos = rect.position;
		draw_pos.y += Math::floor((rect.size.y - p_cell.text_buf->get_size().y) / 2.0);
		p_cell.text_buf->set_width(MAX(0, rect.size.width));
		if (p_ol_size > 0 && p_ol_color.a > 0) {
			p_cell.text_buf->draw_outline(ci, draw_pos, p_ol_size, p_ol_color);
		}
		p_cell.text_buf->draw(ci, draw_pos, p_color);
	}
}
void Tree::update_column(int p_col) {