commit https://github.com/vim/vim/commit/e59215c7dcae17b03daf39517560cfaa03314f5a Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 14 19:08:45 2016 +0200 patch 7.4.2212 Problem: Mark " is not set when closing a window in another tab. (Guraga) Solution: Check all tabs for the window to be valid. (based on patch by Hirohito Higashi, closes https://github.com/vim/vim/issues/974)

Tests for writefile()

STARTTEST
:source small.vim
:%delete _
:let f = tempname()
:call writefile(["over","written"], f, "b")
:call writefile(["hello","world"], f, "b")
:call writefile(["!", "good"], f, "a")
:call writefile(["morning"], f, "ab")
:call writefile(["", "vimmers"], f, "ab")
:bwipeout!
:$put =readfile(f)
:1 delete _
:w! test.out
:call delete(f)
:qa!
ENDTEST