patch 8.1.2377: GUI: when losing focus a pending operator is executed Commit: https://github.com/vim/vim/commit/fa5612c7d836eb789e0f8ff4b10461b8640a14b2 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Dec 1 19:37:07 2019 +0100 patch 8.1.2377: GUI: when losing focus a pending operator is executed Problem: GUI: when losing focus a pending operator is executed. Solution: Do not execute an operator when getting K_IGNORE. (closes https://github.com/vim/vim/issues/5300)

" Vim filetype plugin file
" Language:	Mathematica
" Maintainer:	Ian Ford <ianf@wolfram.com>
" Last Change:	22 January 2019

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
	finish
endif

" Don't load another plugin for this buffer
let b:did_ftplugin = 1

let b:undo_ftplugin = "setlocal commentstring<"

setlocal commentstring=\(*%s*\)