'File already exists' message easy to miss

[mcackay]

Thank you for implementing the Copy-to and Move-to function!

Been using them the past few days, and have noticed that it can be easy to miss a failed-copy/move, as the style of the alert is so similar to the success one.

Suggest one or more of the following:

• Change the colour of the 'failure' overlay to red
• Playing a different sound for success and failure
• Increase the time the failure overlay remains on screen before fading out and block further image navigation until the error has faded; OR \ Failure overlays should persist until you navigate to another image ... and navigation should be temporarily blocked so you can't inadvertently skip past the error if quickly doing a copy-next-copy-next sequence, etc.

[phaibin]

Good advice. I will fix it.

[mcackay]

Thanks @phaibin.\ The persistent dialog makes it impossible to miss the error 😄

I've raised a minor improvement suggestion:

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