Double-click to select a file in FileOpen / FileSave dialogs

[Dorbmon]

Description:

Support Double-click to select a file in FileOpen / FileSave dialogs

Fixes #4676

Checklist:

• Tests included.
• Lint and formatter run with no errors.
• Tests all pass.

[coveralls]

coverage: 64.892% (+0.03%) from 64.861%
when pulling 0fe8f75 on Dorbmon:4700418
into 66b892d on fyne-io:develop.

[andydotxyz]

This is a lot more functionality into the fileItem to handle one new callback - can you talk through why this was necessary?

I would have thought that either you could add DoubleTapped to the item (it should not delay as it does not actually have a single tapped handler - that is in the parent).

Thanks for working on this, I just want to check this is the simplest approach.

[Dorbmon]

This is a lot more functionality into the fileItem to handle one new callback - can you talk through why this was necessary?

I would have thought that either you could add DoubleTapped to the item (it should not delay as it does not actually have a single tapped handler - that is in the parent).

Thanks for working on this, I just want to check this is the simplest approach.

Since fileDialogItem also needs to handle click events (which were previously handled by grid or list), the click event of the list seems to override the event of the item. Therefore, I moved the click event handling into fileDialogItem as well.

[dweymouth]

LGTM now, but I think we should give @andydotxyz a chance to take another look