Clear selection when selecting single item

[damischa]

Default behaviour in Roundcube's message list is to not clear previous selections if user clicks (without any multiselect modifier keys) on a message that is already selected. This behaviour is different from the traditional listboxes. When single-selecting item from a listbox, having multiple items selected before, the initial selection is cleared and only that single item becomes selected. I'd myself prefer the traditional behaviour.

Sorry about not providing showcase, try this instead:
1. Select multiple messages from list (keeping shift or control down)
2. Click one of the selected items (WITHOUT shift or control) -> nothing happens

What should happen, if we implement the traditional listbox behaviour, is to clear the multiselection and make only the clicked message selected.

[damischa]

Patch (diff -u) against trunk to change the behaviour.

[alec]

in the same time I was making my own patch, I was working on app.js, but I think it should be done in damischa's way

[alec]

Fixed in r1243