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Unwanted split is open when using Preview
Pressing 'P' when cursor is on a tag opens preview window as expected, but also opens a new, unwanted, split.
I tried to disable every possibly conflicting plugin, to no avail
Here's a screenshot showing the issue:

The unwanted split appears something like half a second after the preview window.
List of plugins I currently use:
Plugin 'VundleVim/Vundle.vim'
Plugin 'flazz/vim-colorschemes'
Plugin 'scrooloose/syntastic'
Plugin 'scrooloose/nerdcommenter'
Plugin 'tpope/vim-fugitive'
Plugin 'mhinz/vim-signify'
Plugin '2072/PHP-Indenting-for-VIm'
Plugin 'shawncplus/phpcomplete.vim'
if has('nvim')
Plugin 'Shougo/deoplete.nvim'
Plugin 'lvht/phpcd.vim'
else
Plugin 'Shougo/neocomplete.vim'
endif
Plugin 'Shougo/neosnippet.vim'
Plugin 'Shougo/neosnippet-snippets'
Plugin 'Auto-Pairs'
Plugin 'surround.vim'
Plugin 'repeat.vim'
Plugin 'vim-scripts/restore_view.vim'
Plugin 'phpfolding.vim'
Plugin 'stephpy/vim-php-cs-fixer'
Plugin 'mattn/emmet-vim'
Plugin 'bonsaiben/bootstrap-snippets'
Plugin 'airblade/vim-gitgutter'
Plugin 'EasyMotion'
Plugin 'edkolev/tmuxline.vim'
Plugin 'zhou13/vim-easyescape'
Plugin 'Tagbar'
Plugin 'matchit.zip'
Plugin 'vim-scripts/nextval'
Plugin 'sieve.vim'
Plugin 'vim-airline/vim-airline'
Plugin 'vim-airline/vim-airline-themes'
Plugin 'mhinz/vim-startify'
Plugin 'ryanoasis/vim-devicons'
Can reproduce this using those versions of Vim:
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Oct 29 2017 16:27:42)
MacOS X (unix) version
Included patches: 1-1200
Compiled by Homebrew
Huge version without GUI. Features included (+) or not (-):
+acl +conceal +file_in_path +libcall +mouse_sgr +profile +tag_old_static +visualextra
+arabic +cryptv +find_in_path +linebreak -mouse_sysmouse +python -tag_any_white +viminfo
+autocmd +cscope +float +lispindent +mouse_urxvt -python3 -tcl +vreplace
-balloon_eval +cursorbind +folding +listcmds +mouse_xterm +quickfix +termguicolors +wildignore
-browse +cursorshape -footer +localmap +multi_byte +reltime +terminal +wildmenu
++builtin_terms +dialog_con +fork() +lua +multi_lang +rightleft +terminfo +windows
+byte_offset +diff -gettext +menu -mzscheme +ruby +termresponse +writebackup
+channel +digraphs -hangul_input +mksession +netbeans_intg +scrollbind +textobjects -X11
+cindent -dnd +iconv +modify_fname +num64 +signs +timers -xfontset
-clientserver -ebcdic +insert_expand +mouse +packages +smartindent +title -xim
+clipboard +emacs_tags +job -mouseshape +path_extra +startuptime -toolbar -xpm
+cmdline_compl +eval +jumplist +mouse_dec +perl +statusline +user_commands -xsmp
+cmdline_hist +ex_extra +keymap -mouse_gpm +persistent_undo -sun_workshop +vertsplit -xterm_clipboard
+cmdline_info +extra_search +lambda -mouse_jsbterm +postscript +syntax +virtualedit -xterm_save
+comments +farsi +langmap +mouse_netterm +printer +tag_binary +visual
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
defaults file: "$VIMRUNTIME/defaults.vim"
fall-back for $VIM: "/usr/local/share/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DMACOS_X_UNIX -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang -L. -fstack-protector -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib
-L/usr/local/lib -o vim -lm -lncurses -liconv -framework Cocoa -L/usr/local/lib -llua -fstack-protector -L/System/Library/Perl/5.18
/darwin-thread-multi-2level/CORE -lperl -F/usr/local/opt/python/Frameworks -framework Python -lruby.2.4.2 -lobjc
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Mar 29 2017 21:14:16)
Rustines incluses : 1-488, 576
Rustines extra : 8.0.0378, 8.0.0377, 8.0.0322, 8.0.0056
Modifié par [email protected]
Compilé par buildd@
Énorme version sans interface graphique. Fonctionnalités incluses (+) ou non (-) :
+acl +conceal +farsi +libcall +mouse_netterm +profile +syntax +visualextra
+arabic +cryptv +file_in_path +linebreak +mouse_sgr +python +tag_binary +viminfo
+autocmd +cscope +find_in_path +lispindent -mouse_sysmouse -python3 +tag_old_static +vreplace
-balloon_eval +cursorbind +float +listcmds +mouse_urxvt +quickfix -tag_any_white +wildignore
-browse +cursorshape +folding +localmap +mouse_xterm +reltime +tcl +wildmenu
++builtin_terms +dialog_con -footer +lua +multi_byte +rightleft +terminfo +windows
+byte_offset +diff +fork() +menu +multi_lang +ruby +termresponse +writebackup
+cindent +digraphs +gettext +mksession -mzscheme +scrollbind +textobjects -X11
-clientserver -dnd -hangul_input +modify_fname +netbeans_intg +signs +title -xfontset
-clipboard -ebcdic +iconv +mouse +path_extra +smartindent -toolbar -xim
+cmdline_compl +emacs_tags +insert_expand -mouseshape +perl -sniff +user_commands -xsmp
+cmdline_hist +eval +jumplist +mouse_dec +persistent_undo +startuptime +vertsplit -xterm_clipboard
+cmdline_info +ex_extra +keymap +mouse_gpm +postscript +statusline +virtualedit -xterm_save
+comments +extra_search +langmap -mouse_jsbterm +printer -sun_workshop +visual -xpm
fichier vimrc système : "$VIM/vimrc"
fichier vimrc utilisateur : "$HOME/.vimrc"
2me fichier vimrc utilisateur : "~/.vim/vimrc"
fichier exrc utilisateur : "$HOME/.exrc"
$VIM par défaut : "/usr/share/vim"
Compilation : gcc -c -I. -Iproto -DHAVE_CONFIG_H -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -U_FORTIFY_SOURCE -
D_FORTIFY_SOURCE=1 -I/usr/include/tcl8.6 -D_REENTRANT=1 -D_THREAD_SAFE=1 -D_LARGEFILE64_SOURCE=1
Édition de liens : gcc -L. -Wl,-z,relro -L/build/ruby2.1-_YpXpM/ruby2.1-2.1.5/debian/lib -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,
-E -fPIE -pie -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim -lm -ltinfo -lnsl -lselinux -lacl -lattr -lgpm -ldl -L/usr/lib -llua5.2
-Wl,-E -fstack-protector -L/usr/local/lib -L/usr/lib/i386-linux-gnu/perl/5.20/CORE -lperl -ldl -lm -lpthread -lcrypt -L/usr/lib/python2.7/co
nfig-i386-linux-gnu -lpython2.7 -lpthread -ldl -lutil -lm -Xlinker -export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions -L/usr/lib/i386-linux-gnu
-ltcl8.6 -ldl -lz -lpthread -lieee -lm -lruby-2.1 -lpthread -lgmp -ldl -lcrypt -lm