activities-switch with tab-bar and multiple frames should show all open activities

[shipmints]

Currently, activities-switch with tab-bar-mode and multiple open frames seems to elide activities that are foreign to the current frame. I'd like to be able to switch activities (and raise the relevant) from wherever I am.

Is this a matter of offering the option to suppress this mapping?

(define-minor-mode activities-tabs-mode
...
  (let ((override-map '((activities-activity-active-p . activities-tabs-activity-active-p)

[alphapapa]

Please see function activities-tabs--tab. We probably need to (optionally?) call the tab-bar-tabs-function with a frame argument.