All-day events and time-based events within the same day create a day heading separation in the sidebar
An easy testcase for the sidebar in 43.1 and nightly, set up a mixture of single-day all day events and some time-based events, in tomorrow's cell in month view:
...and this will be the result in the sidebar:
...it doesn't make sense that "Tomorrow" would be shown twice. Also, we can see there that the chronological order is inverted (issue #936).
Overall, this can lead to some pretty ridiculously cluttered situations (for example, in the screenshot below taken on August 31st, where we have 3 headers for the next day, September 1st / Tomorrow, and 3 headers for the day that follows it... simply because I have a mix of time-based, all-day-single-day and multi-day events):
Edited by Jeff Fortin