[Time List view] Time List should not "auto-center"

[charlesh88]

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When the Time List view is displaying a number of current events, it will continually try to vertically "auto-center" the display. This can have the result of hiding current events at the top of the list:

Describe the solution you'd like
Change the "centering on now" approach to this algorithm:

1. Show as many current and/or future events as possible, without scrolling any of either type beyond the top of the view area.
2. Only show past events if all other current and future events can be displayed.
3. If there are no past events in the current data set, then the centering algorithm could be turned off for efficiency.

This would be at the expense of scrolling past items beyond the top of the view when necessary.

[shefalijoshi]

Testing instructions:
See above screenshots.
Current and Future activities should always be scrolled into view first
If there is room left over after displaying ALL current and future activities, then only a subset of past activities should be displayed.
If all activities are viewable in the current view then no auto scrolling should occur.
If there are no past activities, there should be no auto scrolling at all.

[shefalijoshi]

Should be fixed by #7194

[davetsay]

verified

[charlesh88]

Testathon 2024-01-31: verified NOT fixed. At some viewport heights, the compact Time List view will still auto-scroll in a way that hides a current Activity. Using the sim-9_025 plan:

Desired: Note current Activity at top in view:

Not desired: When auto-scrolled, top current Activity is now hidden:

Details for this are captured in #7449.

[unlikelyzero]

Won't fix and do #7449