Fails for multi-byte characters

[ei14]

Unicode characters that exceed one byte are not treated correctly.

Minimal example

.vimrc

let g:AutoPairs = {"X": "Y", "《": "》"}
imap ABC 《

The characters "《" and "》" are Unicode U+300A and U+300B respectively. They can be typed natively in Vim by typing <C-k><LT>+ and <C-k>>+ respectively. Other multi-byte characters will also present the bug.

Reproduction steps

• Open Vim
• Open insert mode (i) and type X.
  • If auto-pairs and the .vimrc are loaded correctly, the line should read XY.
• Press <BS> to remove both the X and Y, leaving an empty buffer.
• Type <C-k><LT>+ (Control+k, less-than symbol, then plus symbol).
  • Expected behavior: The line should read 《》.
  • Actual behavior: The line reads 《. The pair doesn't pair.
• Press <BS> to clear the buffer.
• Type ABC.
  • Expected behavior: The line should read 《》
    • By mapping ABC to 《 and enabling recursive mapping, the 《 character should be typed, causing auto-pairs to complete the pair.
  • Actual behavior: ERROR:

- E115: Missing single quote: 'ã                                                                                
- E116: Invalid arguments for function AutoPairsInsert('ã
+ Press ENTER or type command to continue

Tested on a fresh vim install in a newly-made Debian VM.

[LunarWatcher]

#280