[image_picker] Fixes crash when an image in the gallery is tapped mor…

[zhongwuzw]

…e than once

Description

Fixes crash when an image in the gallery is tapped more than once

Related Issues

flutter/flutter#55063

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[cyanglaz]

Thank you for the PR!
#2625 seems similar. We are waiting for test to land that PR. If you can help @iheron to add test that'd be great! Or if you can add tests in your PR that'd be good too.

[zhongwuzw]

@cyanglaz I added one test to simulate the crash when pick image multiple times. I can help #2625 to add their test.

[cyanglaz]

@zhongwuzw This is great! Thanks. The other PR is pretty similar to this one. I'm going to land this, and the other PR might need to rebase.