### 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_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.width = p_cell.icon_max_w;
		}
		w += bmsize.width + theme_cache.h_separation;
		if (rect.size.width > 0 && (w + ts.width) > rect.size.width) {
			ts.width = rect.size.width - w;
		}
	}
	w += ts.width;
	switch (p_cell.text_alignment) {
		case HORIZONTAL_ALIGNMENT_FILL:
		case HORIZONTAL_ALIGNMENT_LEFT: {
			if (rtl) {
				rect.position.x += MAX(0, (rect.size.width - w));
			}
		} break;
		case HORIZONTAL_ALIGNMENT_CENTER:
			rect.position.x += MAX(0, (rect.size.width - w) / 2);
			break;
		case HORIZONTAL_ALIGNMENT_RIGHT:
			if (!rtl) {
				rect.position.x += MAX(0, (rect.size.width - w));
			}
			break;
	}
	RID ci = get_canvas_item();
	if (rtl) {
		Point2 draw_pos = rect.position;