> But I'm struggling to find the right combination of events/whatever to fire 
> when the visible part (viewport?) of a buffer changes. For example, as a 
> result of a page down, normal mode G jumping to the end of the buffer, gg to 
> go to the top, etc. I want to use such an event to call matchaddpos to 
> highlight the now-visible part of the buffer (which keeps the number of calls 
> to matchaddpos down).

Apologies - it seems I've been making a basic error in my use of winsaveview(); 
using that in combination with CusorMoved, CusorMovedI, winheight() and 
winwidth() gets me a lot of the way there.

The one remaining case I can't currently handle is when the size of a split 
changes: I need to somehow trigger the change in viewport for all buffers 
affected by, for example, moving the horizontal/vertical split point.

Again, any pointers much appreciated.

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