Add support for "single" mode to "delete_button" plugin

[brianreavis]

Place an "x" to the left of the dropdown arrow for better usability.

Related: #123, #113

[nesl247]

Any idea when this might happen? When you add support for this, what option gets marked as selected? If it gets set to an empty option, can you give us the option to have it reset back to a specific option value?

[jamilabreu]

+1

[heldchen]

+1, this would be a nice workaround for the single-mode delete problem on android

[ghost]

+1

[pgouv]

+1

[jamilabreu]

Seems like @mudassir0909 might have created an (as of now) unofficial plugin for this issue. I've yet to try it: #163

[jacek213]

+1

[stefanmeschke]

+1

[tonimoeckel]

+1

[namkazt]

still not happen in 2018 👯‍♂️

[Pictor13]

Would #1311 make you happy?

I chose to keep the 'x' close to the items, since atm there is a bug that allows to load multiple values even when the mode = 'single'.
You can see that bug trying to use awsome,neat as input value, in the single-select example I added to the plugin page.
In that case there would be overlapping multiple crosses, if positioned close to the dropdown-arrow; hence the crosses close to the items.

[risadams]

closing stale issues older than one year.
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