Allow to use key shortcut to operate multi-cursors #212
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Allow to use key shortcut to operate multi-cursors. You can use:
ctrl_shift_up: add_cursor_above
ctrl_shift_down: add_cursor_below
alt_shift_up: delete_cursor_above
alt_shift_down: delete_cursor_above
If you merge this PR, I can update corresponding description for multi cursors in wiki.
Besides, I just recommend code should set "ctrl_home" and "ctrl_end" to go top and bottom of the buffer and I can use "ctrl_up" and "ctrl_down" to add cursor above/below. And I believe "ctrl_home" and "ctrl_end" are more logical.
What's more, remove 2 bugs:
1. Removed the duplicate Zsh check in quickcomment.lua and added a check for Batch.
2. Removed the multi-cursors bug when anyone of them is at the top or end. Reproduce steps:
a. Create multiple cursors and one of them is at the top or end of the doc.
b. Move cursor up or down.
c. Type sth.