my_spinner

Puts a buttonless spinner element into the current figure. The number in the spinner can be changed using the arrow-keys, with the magnitude of the change depending on the cursor position. This is helpful in tweaking a number in an input field.
Under the hood, this spinner element is an "edit" uicomponent with some special callbacks attached to the underlying Java element. The return value is the (Matlab) handle to this edit field. IMPORTANT: This function uses undocumented, and possibly unstable Matlab functionality. It was tested with with Matlab2016a.