Dropdown mode doesn't work on full-width (e.g. dashboard)

[peterspicer-catalyst]

Reported by Jakub,

When full-width (dashboard), the drop-down presentation mode is not tall enough to accomodate the config context menu, so the first item gets cut. This means one cannot configure the block, until one moves it to the side region where it resizes.

Admittedly, this is a silly way to use dropdown mode, but what if.

[peterspicer-catalyst]

This is easier to produce in Moodle Workplace, incidentally.