[vbezhenar]

I still feel these issues could be solved one by one.

Button click will automatically disable it, until its handler executed. There could be creative animations translating this state to the user in an intuitive way, so the button does not feel stuck and does not feel doing nothing.

Scroll widget should require some placeholder graphics which will be displayed until loading handler executed and replaced this placeholder with real data. A lot of apps already do exactly that.