Okay, here are some additional data points.

Attempt 1 (good)

1. Open gedit
2. Type some text
3. Select some text
4. Copy
5. Move cursor
6. Tap top-right of touchpad
7. DOES NOT paste

Attempt 2 (bad)

1. Open Google Chrome
2. Select text on page
3. Return to gedit
4. Tap top-right of touchpad
5. PASTES

Attempt 3 (good)

1. Open xfce4 Terminal
2. Select some text
3. Right-click, copy
4. Return to gedit
5. Tap top-right of touchpad
6. DOES NOT paste

Summary: whether the paste bug occurs depends on which app was used to
copy the text. It also depends on which app is receiving the paste, but
that list of apps is different.

Here's another really weird element of this problem: when the paste
occurs in gedit, as in attempt 2, it pastes at the current mouse
location, NOT at the location of the text caret.  So it's not simply
that the mouse driver is triggering a Ctrl-V, otherwise the text would
appear at the text caret.

In gedit, the paste bug DOES NOT move the text caret, so it's not
causing an actual mouse click before the paste; it's pasting INSTEAD of
clicking. In Chrome the caret moves along with the paste in the new
location. Caveat: if App 1 is active and I hover over App 2, then tap
the top-right, the paste occurs in App 2.

I tried copying and pasting images in Gimp but the problem doesn't seem
to occur with image content.

COPY - Apps I've tested where copying triggers a paste:
- Google Chrome
- Firefox
- Character Map
- AbiWord

COPY - Apps that do not cause a paste:
- Gedit
- xfce4-terminal

PASTE - Apps that receive a paste (if copied from one of the apps above):
- Google Chrome
- Firefox
- Gedit
- xfce4-terminal
- Character Map

PASTE - Apps that do not receive a paste (regardless of how it was copied):
- AbiWord

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1511496

Title:
  Synaptics touchpad pastes when clicked in the top-right corner

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1511496/+subscriptions

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