spacemacs: how to unset the keybinding of undo with 'u'

Question

I don't want to have key 'u' bound to undo-tree-undo, as it's too conveniently dangerous to confuse with u for universal argument prefix.

I tried

(global-unset-key "u")

But it didn't have any effect. How can I achieve my goal?

Furthermore, the above code has a disasterous effect of redenring key 'u' not working at all. I could not even input letter 'u'.

Edit: based on Drew's suggestion, here is the likely relevant key map:

undo-tree-map is a variable defined in ‘undo-tree.el’.
Its value is shown below.

  This variable may be risky if used as a file-local variable.

Documentation:
Keymap used in undo-tree-mode.

Value: (keymap
 (24 keymap
     (114 keymap
          (85 . undo-tree-restore-state-from-register)
          (117 . undo-tree-save-state-to-register))
     (117 . undo-tree-visualize))
 (27 keymap
     (95 . undo-tree-redo))
 (67108927 . undo-tree-redo)
 (31 . undo-tree-undo)
 (67108911 . undo-tree-undo)
 (remap keymap
        (redo . undo-tree-redo)
        (undo-only . undo-tree-undo)
        (undo . undo-tree-undo)))

I still need help (an example) on how to manipulate it. Especially, how to translate the numbers to the key name to understand further how to modify.

Unbind it in the local keymap. Look for a keymap used by `undo-tree` - maybe `undo-tree-mode-map` or something. — Drew, Aug 30 '17 at 23:42

score 0 · Accepted Answer · answered Nov 12 '17 at 00:21

0

Following Drew's advice, try this:

(unbind-key (kbd "u") evil-normal-state-map)

Here's how I found out which keymap to unbind it in: How can I find out in which keymap a key is bound?

answered Nov 12 '17 at 00:21

Croad Langshan

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Sorry, I made a mistake in clicking on the wrong button. But I cannot correct it. Really strange. – Yu Shen Nov 22 '17 at 20:39
click on up arrow doesn't work? maybe you have to click down arrow first? – Croad Langshan Dec 05 '17 at 16:56

spacemacs: how to unset the keybinding of undo with 'u'

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