Containers and the other resizeable diagram elements (concepts, text blocks, images, shapes, memos, paragraphs) can only be resized from their bottom edge, their right edge and the bottom-right corner. There are no grab handles on the top and left edge, so the only way to change where the top-left of a shape sits is to resize it from the bottom-right and then drag the whole shape back into place.

There is no cursor feedback either: the pointer keeps showing the ordinary hand cursor over a grab handle, so it is not visible where a shape can be grabbed to resize it. The grab area also does not follow the zoom level, so at higher zoom the painted handle is larger than the area that actually reacts to a click, and a click that visually lands on a handle moves the shape instead of resizing it.

Expected behaviour: grab handles on all four edges and all four corners, a sizing cursor over each handle, and a grab area that matches the handle exactly as it is drawn.

Dragging the top or left handle of a container must leave the container's contents untouched at their absolute position - only the box changes - and it must not be possible to shrink a container through its own contents.