Prerequisites

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Description

I'm trying out edge (586b818) since #15314 was merged. I have a command bound to alt-n (a composing diacritic in the macOS US keyboard layout) that moves the cursor. Under Atom 0.19 the keystroke would run the command and insert the diacritic. On this edge version, it only runs the command, which is awesome. 🎉

BUT, it seems like some internal buffer state then gets messed up. If after the alt-n I move the cursor with the arrows, and then insert a character, the cursor seems to jump back to where the alt-n left me, and the character gets inserted there. If I use a command that isn't a composition character, like alt-o, then the problem does not occur.

Steps to Reproduce

Keymap

'atom-text-editor':
  'alt-n': 'core:move-down'
  'alt-o': 'core:move-down'

1. Add the keymap above to your ~/.atom/keymap.cson
2. Have two lines of text in your buffer:

Foo
Bar

3. Have the cursor at the beginning of file(before F character) Type alt-n, then arrow right, then insert a character. Observe that the character is inserted at the beginning of the line (where the alt-n left you).
4. Repeat 2-3 using alt-o instead of alt-n. Observe the insertion happens where the cursor is, as expected.

Expected behavior: Character insertion following alt-n inserts the character where the cursor is.

Actual behavior: Character insertion following alt-n inserts the character at the wrong place (seems to be where the alt-n leaves you).

Reproduces how often: Always.

Versions

Atom : 1.21.0-dev-586b818ba
Electron: 1.6.9
Chrome : 56.0.2924.87
Node : 7.4.0
OS: macOS Sierra 10.12.6