fix(mobile): the page for adding photos to the album cannot be navigated back using gestures

[ExceptionsOccur]

fix(mobile): the page for adding photos to the album cannot be navigated back using gestures #16449

[shenlong-tanwen]

@ExceptionsOccur Thanks a lot for the fix. Can you rebase the branch over main and remove the changes in other files. The fix is only in the file immich_asset_grid_view.dart, but your diff contains other changes as well.

[ExceptionsOccur]

@ExceptionsOccur Thanks a lot for the fix. Can you rebase the branch over main and remove the changes in other files. The fix is only in the file immich_asset_grid_view.dart, but your diff contains other changes as well.

Alright, the code for the other part will be submitted in a new PR.

[shenlong-tanwen]

Alright, the code for the other part will be submitted in a new PR.

A small remark though, your change makes the back gesture deselect all assets and immediately close the selection page. However, it is a much better experience if the first gesture deselects the assets and the next one goes back. The actual change to handle this is rather simple, you just need to find the difference between the selectedAssets and the preselectedAssets and prevent pop when the difference is empty

[ExceptionsOccur]

Alright, the code for the other part will be submitted in a new PR.

A small remark though, your change makes the back gesture deselect all assets and immediately close the selection page. However, it is a much better experience if the first gesture deselects the assets and the next one goes back. The actual change to handle this is rather simple, you just need to find the difference between the selectedAssets and the preselectedAssets and prevent pop when the difference is empty

Indeed, it can be done this way. I will optimize it later. Mainly, I remember that before it was returned directly, so when I fixed it, I also did it according to the previous idea.

[ExceptionsOccur]

The first time the selection is canceled, the second time it will return; if there are no new selections, it will return directly

[shenlong-tanwen]

Shouldn't always assume the widget.preselectedAssets value will be available and should handle it being null more gracefully.