✨ new scm icon

fixes #18675

src/vs/workbench/parts/scm/electron-browser/media/icon.svg

-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 448">
-<g fill="#fff">
-<path d="M376 72c0-39.703-32.313-72-72-72s-72 32.297-72 72c0 34.121 23.926 62.629 55.828 70.012-.461 26.268-13.535 50.564-35.453 65.176L208 236.766l-44.375-29.578c-21.918-14.611-34.99-38.92-35.453-65.174C160.082 134.635 184 106.123 184 72c0-39.703-32.297-72-72-72S40 32.297 40 72c0 34.254 24.09 62.879 56.186 70.123.498 36.928 18.881 71.146 49.689 91.689L192 264.555v41.381c-32 7.318-56 35.893-56 70.064 0 39.688 32.297 72 72 72s72-32.313 72-72c0-34.172-24-62.746-56-70.064v-41.381l46.125-30.742c30.793-20.529 49.191-54.744 49.689-91.689C351.902 134.879 376 106.252 376 72zM72 72c0-22.063 17.938-40 40-40s40 17.938 40 40-17.938 40-40 40-40-17.937-40-40zm176 304c0 22.063-17.938 40-40 40s-40-17.938-40-40 17.938-40 40-40 40 17.938 40 40zm56-264c-22.063 0-40-17.938-40-40s17.938-40 40-40 40 17.938 40 40-17.937 40-40 40z"/>
-</g>
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="10px" height="16px" viewBox="0 0 10 16" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 40.3 (33839) - http://www.bohemiancoding.com/sketch -->
+    <title>repo-forked</title>
+    <desc>Created with Sketch.</desc>
+    <defs></defs>
+    <g id="Octicons" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="repo-forked" fill="#fff">
+            <path d="M8,1 C6.89,1 6,1.89 6,3 C6,3.73 6.41,4.38 7,4.72 L7,6 L5,8 L3,6 L3,4.72 C3.59,4.38 4,3.74 4,3 C4,1.89 3.11,1 2,1 C0.89,1 0,1.89 0,3 C0,3.73 0.41,4.38 1,4.72 L1,6.5 L4,9.5 L4,11.28 C3.41,11.62 3,12.26 3,13 C3,14.11 3.89,15 5,15 C6.11,15 7,14.11 7,13 C7,12.27 6.59,11.62 6,11.28 L6,9.5 L9,6.5 L9,4.72 C9.59,4.38 10,3.74 10,3 C10,1.89 9.11,1 8,1 L8,1 Z M2,4.2 C1.34,4.2 0.8,3.65 0.8,3 C0.8,2.35 1.35,1.8 2,1.8 C2.65,1.8 3.2,2.35 3.2,3 C3.2,3.65 2.65,4.2 2,4.2 L2,4.2 Z M5,14.2 C4.34,14.2 3.8,13.65 3.8,13 C3.8,12.35 4.35,11.8 5,11.8 C5.65,11.8 6.2,12.35 6.2,13 C6.2,13.65 5.65,14.2 5,14.2 L5,14.2 Z M8,4.2 C7.34,4.2 6.8,3.65 6.8,3 C6.8,2.35 7.35,1.8 8,1.8 C8.65,1.8 9.2,2.35 9.2,3 C9.2,3.65 8.65,4.2 8,4.2 L8,4.2 Z" id="Shape"></path>
+        </g>
+    </g>
 </svg>
\ No newline at end of file

src/vs/workbench/parts/scm/electron-browser/media/scmViewlet.css

@@ -5,7 +5,7 @@
 
 .monaco-workbench > .activitybar > .content .monaco-action-bar .action-label.scm {
 	background-image: url('icon.svg');
-	background-size: 26px;
+	background-size: 19px;
 	background-position: center;
 }