How can I disable single-click to open on Pantheon/Elementary?

For Freya, apparently installing Elementary Tweaks and changing the setting there works:

apt-get install elementary-tweaks

Then, access the Settings Menu and click on the Tweaks Icon.

settings tweak menu

You can then toggle Single Click on/off as you like.

Unfortunately, this didn't work for me, and the setting immediately toggled back on as soon as I exited the settings menu.

I had better luck with the following command:

gsettings set org.pantheon.files.preferences single-click false

Newer pantheon-files needs:

gsettings set io.elementary.files.preferences single-click false

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