Increased the delay when waiting for map rendering updates. #2511
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Fixes #2509
Increases the delay when waiting for map rendering updates.
The test case passes consistently when run in slow mode; when running in fast mode, there's an appreciable "stutter" in rendering, which, depending on exact testing conditions, can result in a test failure. Increasing the delay gives the web view a little more time to complete rendering, which seems to avoid the problem.
Not sure why this suddenly started being a problem 2 days ago - my guess would be a change in how leaflet is deployed, but that's difficult to verify.
I've speculatively made the same change to the Winforms implementation, since it's using same underlying implementation.
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