Slow icon update on first view of explorer folder

Hi folks,

Not sure if this is normal expected behaviour. When I open a versioned
folder for the first time, the overlays trickle through the page. It's
quite a fast trickle, perhaps 30-40 icons per second, but with a lot
of items in a folder, e.g. doc/source/en/dug it can take a couple of
seconds. If I navigate away and come back to the folder the overlay
drawing is instant. This occurs even if I start explorer and leave the
PC idle for 5 minutes to allow any background scanning to complete.

This is certainly not badly slow, but I remember a similar behaviour a
few years ago, perhaps during 1.2 or 1.3 development and in that
instance it was due to a bug. I'm assuming this is related to
TSVNCache somehow, but I thought it scanned working copies in the
background rather than waiting until they are accessed the first time.

Simon

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