The equivalent touchpad tap actually doesn't exist in Xorg by default anymore.
To get it back (click with three fingers) you need:
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Touch seeded packages, which is subscribed to content-hub in Ubuntu.
Middle-click clipboard no longer works
Status in Canonical System Image:
Status in content-hub package in Ubuntu:
Status in ubuntu-ui-toolkit package in Ubuntu:
Status in unity8 package in Ubuntu:
Under X, any selected text would be automatically be added to a
seperate clipboard whose contents could be pasted by pressing the
middle-click button or the equivalent touchpad tap.
I understand it's an X functionality, and I'm asking it to be
implemented in Mir.
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