Change trash icon command in Unity

I have recently replaced my default file manger from Nautilus to Dolphin, so I would like when I click on the trash icon (in left narrow panel), Dolphin opens trash folder not Nautilus. For this I've set Dolphin as the default file manger.

Now, when I click on the trash icon, Dolphin opens and shows a message saying

Malformed URL trash://

Apparently clicking on the trash icon causes a command to run. But in Dolphin URL trash:/ works fine.

How can I change the command that runs when user clicks on the trash icon? I should replace trash:// to trash:/ there.

Solution 1:

Looks like it's a bug related to Dolphin with a fix on the way. https://bugs.kde.org/show_bug.cgi?id=353181