Agenda view scrolls to top while loading events

[armhub]

When viewing the agenda view while events are processed after logging in, the event list steadily jumps to the top again when scrolled down. This is visible on mobile with long lists of events.

How to reproduce:

• Prepare a day with many calendar events, e.g. 10
• Log in into the account when events need to be processed.
• Switch to the agenda view for that day.
• Scroll down to see the last events on the day.
  -> The view always jumps back to top

This behavior is not new but has been existing for along time already. Reproduced in Android v244.240903.0

[juni2k]

Still investigating, but curiously this only happens in the mobile/narrow view. Desktop/wide mode does not exhibit this problem at all.

[juni2k]

Seems to be related to multiple pages sharing the same view model (thanks @ganthern for spotting this)
Strange behaviour described in this issue disappears when previousPage and nextPage are supplied with an empty node list.

tutanota/src/calendar-app/calendar/view/CalendarAgendaView.ts

Lines 165 to 177 in a259fee

	return m(PageView, {
	previousPage: {
	key: previousDay.getTime(),
	nodes: this.renderMobileEventList(previousDay, attrs),
	},
	currentPage: {
	key: day.getTime(),
	nodes: this.renderMobileEventList(day, attrs),
	},
	nextPage: {
	key: nextDay.getTime(),
	nodes: this.renderMobileEventList(nextDay, attrs),
	},