tikz-layers (17feb18)

git-svn-id: svn://tug.org/texlive/trunk@46660 c570f23f-e606-0410-a88d-b1316a301751

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diff --git a/Master/texmf-dist/tex/latex/tikz-layers/tikz-layers.sty b/Master/texmf-dist/tex/latex/tikz-layers/tikz-layers.sty
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+%% tikz-layers.sty
+%% Copyright 2018 Rui Moutinho
+%
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+%
+% This work has the LPPL maintenance status `maintained'.
+%
+% The Current Maintainer of this work is Rui Moutinho.
+%
+% This work consists of the files listed on manifest.txt.
+
+\ProvidesPackage{tikz-layers}[2018/02/15 v0.9 Installs basic layers via TikZ]
+
+\RequirePackage{tikz}
+\usetikzlibrary{backgrounds}
+
+\pgfdeclarelayer{behind}
+\pgfdeclarelayer{above}
+\pgfdeclarelayer{glass}
+
+\pgfsetlayers{background,behind,main,above,glass}
+
+\tikzset{
+    on layer/.style = {execute at begin scope={\pgfonlayer{#1}}, execute at end scope={\endpgfonlayer}},
+    on behind layer/.style = {on layer=behind},
+    on above layer/.style = {on layer=above},
+    on glass layer/.style = {on layer=glass},
+}