Confirmed that Thunar Behavior settings has single-click to activate items disabled.
Observing this behavior on three machines, one of which is a laptop.
The behavior is not limited to any one application or window.
Rarely use the right mouse. But a single left click does exhibit windows maximizing that normally requires a double-click.
On Thunderbird, a single click on an item in the Subject link may launch the message window that normally requires a double-click.
This behavior became apparent with the stable update of 2022-06-12.
Changed one of the mice. The problems seem to be related to the mouse. Will have to disassemble the other mouse and clean to confirm.
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