Expand Finder column width with keyboard shortcut

I can expand the column width in Finder (OS X El Capitan, MacBook Pro) by clicking on the right-hand line of the column (see red arrow in screenshot). When I click this line, the column width is expanded to the width of the longest file name. How can I do the same with a keyboard shortcut?

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Solution 1:

The answer to this thread pretty much points out the problem with keyboard shortcuts.

Keyboard shortcut (or permanent setting) for fitting column width to longest filename in OS X?