Reprojected ImageryLayers cause a crash if show is toggled before the tiles have loaded

[denverpierce]

To reproduce, run the below in sandcastle 1.20, and zoom/pan until you get an uncached tile:

https://gist.github.com/denverpierce/72179dce5bbfd850df3c356f9df07ba6

This only happens with layers that require reprojection from webmercator and retrieving tiles from a 'slow' server and toggling the ImageryLayer's show property quickly.

[hpinkos]

Thanks for the code sample @denverpierce!
I can confirm that this crash happens in 1.20 but it looks like it has already been fixed in master.
If you are still seeing this problem in 1.21, please reopen this issue. Thanks again!

[denverpierce]

Still happens in 1.21 7fc81f7 consistently.

I mainly get it when loading tiles that are not in the browser cache, and it's very easy to trigger when loading tiles from a server that is particularly slow.

P.S. gist loading is great.

[denverpierce]

Not sure if I can reopen this, but here's a gif of it in 1.21:

[hpinkos]

Thanks @denverpierce. I didn't let it run for long enough. It insta-crashed for me in 1.20 but not in master. I can confirm this is a still a problem though, so I re-opened the issue.

[hpinkos]

@denverpierce are you able to still reproduce this one? I think we may have actually fixed it this time. I let it run for like 2 or 3 minutes and it didn't crash for me. In 1.21 it crashed in like 20 seconds

[mramato]

@hpinkos that's caused I fixed this in #4258 😄 Didn't realize this bug existed since it is a dupe of #4083

[mramato]

Of @denverpierce if you are still having an issue, please re-open this.

[denverpierce]

Yeah I haven't checked it, but fairly certain its the same as #4083