Pixel-perfect icons with no aliasing for code folding #3299

src/vs/editor/contrib/folding/browser/arrow-collapse-dark.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 19.2.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+	 viewBox="0 0 15 15" style="enable-background:new 0 0 15 15;" xml:space="preserve">
 <style type="text/css">
-	.st0{fill:#FFFFFF;}
+	.st0{fill:#5A5A5A;}
+	.st1{fill:none;stroke:#C5C5C5;stroke-miterlimit:10;}
 </style>
-<path class="st0" d="M2,2v12h12V2H2z M13,13H3V3h10V13z"/>
-<path id="XMLID_5_" class="st0" d="M12,9H9v3H7V9H4V7h3V4h2v3h3V9z"/>
+<g id="iconBg">
+	<g>
+		<path class="st0" d="M12,3v9H3V3H12 M13,2H2v11h11V2L13,2z"/>
+	</g>
+</g>
+<g>
+	<g>
+		<line class="st1" x1="11" y1="7.5" x2="4" y2="7.5"/>
+	</g>
+	<g>
+		<line class="st1" x1="7.5" y1="4" x2="7.5" y2="11"/>
+	</g>
+</g>
 </svg>

src/vs/editor/contrib/folding/browser/arrow-collapse.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 19.2.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+	 viewBox="0 0 15 15" style="enable-background:new 0 0 15 15;" xml:space="preserve">
 <style type="text/css">
-	.icon_x002D_vso_x002D_bg{fill:#656565;}
+	.st0{fill:none;stroke:#6B6B6B;stroke-miterlimit:10;}
+	.st1{fill:#B6B6B6;}
 </style>
-<path class="icon_x002D_vso_x002D_bg" d="M2,2v12h12V2H2z M13,13H3V3h10V13z"/>
-<path id="XMLID_5_" d="M12,9H9v3H7V9H4V7h3V4h2v3h3V9z"/>
+<g>
+	<line class="st0" x1="7.5" y1="4" x2="7.5" y2="11"/>
+	<line class="st0" x1="11" y1="7.5" x2="4" y2="7.5"/>
+</g>
+<g id="iconBg">
+	<g>
+		<path class="st1" d="M12,3v9H3V3H12 M13,2H2v11h11V2L13,2z"/>
+	</g>
+</g>
 </svg>

src/vs/editor/contrib/folding/browser/arrow-expand-dark.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 19.2.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+	 viewBox="0 0 15 15" style="enable-background:new 0 0 15 15;" xml:space="preserve">
 <style type="text/css">
-	.st0{fill:#FFFFFF;}
+	.st0{fill:#5A5A5A;}
+	.st1{fill:none;stroke:#C5C5C5;stroke-miterlimit:10;}
 </style>
-<path class="st0" d="M2,2v12h12V2H2z M13,13H3V3h10V13z"/>
-<path id="XMLID_5_" class="st0" d="M12,9H4V7h8V9z"/>
+<g id="iconBg">
+	<g>
+		<path class="st0" d="M12,3v9H3V3H12 M13,2H2v11h11V2L13,2z"/>
+	</g>
+</g>
+<g>
+	<line class="st1" x1="11" y1="7.5" x2="4" y2="7.5"/>
+</g>
 </svg>

src/vs/editor/contrib/folding/browser/arrow-expand.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 19.2.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+	 viewBox="0 0 15 15" style="enable-background:new 0 0 15 15;" xml:space="preserve">
 <style type="text/css">
-	.icon_x002D_vso_x002D_bg{fill:#656565;}
+	.st0{fill:#B6B6B6;}
+	.st1{fill:none;stroke:#6B6B6B;stroke-miterlimit:10;}
 </style>
-<path class="icon_x002D_vso_x002D_bg" d="M2,2v12h12V2H2z M13,13H3V3h10V13z"/>
-<path id="XMLID_5_" d="M12,9H4V7h8V9z"/>
+<g id="iconBg">
+	<g>
+		<path class="st0" d="M12,3v9H3V3H12 M13,2H2v11h11V2L13,2z"/>
+	</g>
+</g>
+<g>
+	<line class="st1" x1="11" y1="7.5" x2="4" y2="7.5"/>
+</g>
 </svg>

src/vs/editor/contrib/folding/browser/folding.css

@@ -6,7 +6,7 @@
 .monaco-editor .margin-view-overlays .folding {
 	background-repeat: no-repeat;
 	background-position-y: center;
-	background-size: 1em 1em;
+	background-size: 15px;
 	border-left: 3px solid transparent; /* copy of what the Git decorator does */
 	margin-left: 5px;
 	cursor: pointer;