This is functionality is no longer available after the switch to GTK3.
https://docs.xfce.org/faq
** Changed in: mousepad (Ubuntu)
Status: New => Invalid
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editing .config/Mousepad/accels.scm helps but still does not work
pressing Backspace and assigning a new accelerator
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https://bugs.launchpad.net/bugs/1527971
Title:
[xubu 15.10] Custom