You may have noticed that the room list acts a bit... odd. You usually
can't scroll all the way down with a scrollwheel, it just
stops. It's possible to continue a little bit more with the scrollbar.
And sometimes the scrollbar doesn't know how big it's actually supposed
to be, commonly occuring when switching from a large room list to a
smaller one.
I narrowed it down the same usual problem with views in QtQuick:
variable sized delegates! Using GammaRay I figured out that for the
delegates currently in use they're slightly different: 46 pixels for
regular room delegates, 42 pixels for section headers and the "Find your
Friends" button was also different.
*Technically* TableView (and by extension TreeView) is supposed to allow
variable-sized delegates, and we should be able to advertise that with
rowHeightProvider. I tried a bunch of different solutions and none of
them worked reliably, so I took the usual sledgehammer approach of
making all of the delegates the same size.
This fixes all of the obvious bugs with the room list I could see, with
the one visual downside of making the section headers slightly taller.
But since I spent some time improving the tap targets, this is only a
visual change and not a functional one.
I also made sure to test it in compact mode, and everything shrinks as
expected.
For some reason I don't understand, the ItemDelegate used for these
sections are ginormous. There is quite a bit of padding which confuses
users as its unexpectedly used for the tap area.
I changed it so we only listen for taps inside of the contentItem
itself, which is a more suitable area.
