Using ivy-fixed-minibuffer-height with ivy-display-function-overlay

[basil-conto]

Issue

When ivy-fixed-minibuffer-height is enabled and a completion uses ivy-display-function-overlay as its ivy-display-function, the minibuffer's height is set to ivy-height (plus 0 or 1) in ivy--minibuffer-setup, as seen in the following two screenshots:

Questions

• Does this behaviour ever make sense, or should ivy-fixed-minibuffer-height and ivy-display-function-overlay be mutually exclusive?
• Is there a way to customise this behaviour without having to advise or modify ivy--minibuffer-setup?

[abo-abo]

Thanks.