Update folding icon to use icon font

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

@@ -3,52 +3,28 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-.monaco-editor .margin-view-overlays .folding {
+.monaco-editor .margin-view-overlays .codicon {
 	cursor: pointer;
-	background-repeat: no-repeat;
-	background-origin: border-box;
-	background-position: calc(50% + 2px) center;
-	background-size: auto calc(100% - 3px);
 	opacity: 0;
 	transition: opacity 0.5s;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	font-size: 140%;
+	margin-left: 2px;
 }
 
-.monaco-editor .margin-view-overlays .folding {
-	background-image: url('tree-expanded-light.svg');
-}
-
-.monaco-editor.hc-black .margin-view-overlays .folding,
-.monaco-editor.vs-dark .margin-view-overlays .folding {
-	background-image: url('tree-expanded-dark.svg');
-}
-
-.monaco-editor.hc-black .margin-view-overlays .folding {
-	background-image: url('tree-expanded-hc.svg');
-}
-
-.monaco-editor .margin-view-overlays:hover .folding,
-.monaco-editor .margin-view-overlays .folding.alwaysShowFoldIcons {
-	opacity: 1;
-}
-
-.monaco-editor .margin-view-overlays .folding.collapsed {
-	background-image: url('tree-collapsed-light.svg');
+.monaco-editor .margin-view-overlays:hover .codicon,
+.monaco-editor .margin-view-overlays .codicon.codicon-chevron-right,
+.monaco-editor .margin-view-overlays .codicon.alwaysShowFoldIcons {
 	opacity: 1;
 }
 
-.monaco-editor.vs-dark .margin-view-overlays .folding.collapsed {
-	background-image: url('tree-collapsed-dark.svg');
-}
-
-.monaco-editor.hc-black .margin-view-overlays .folding.collapsed {
-	background-image: url('tree-collapsed-hc.svg');
-}
-
 .monaco-editor .inline-folded:after {
 	color: grey;
 	margin: 0.1em 0.2em 0 0.2em;
 	content: "⋯";
 	display: inline;
 	line-height: 1em;
 	cursor: pointer;
-}
+}

src/vs/editor/contrib/folding/foldingDecorations.ts

@@ -13,17 +13,17 @@ export class FoldingDecorationProvider implements IDecorationProvider {
 	private static COLLAPSED_VISUAL_DECORATION = ModelDecorationOptions.register({
 		stickiness: TrackedRangeStickiness.NeverGrowsWhenTypingAtEdges,
 		afterContentClassName: 'inline-folded',
-		linesDecorationsClassName: 'folding collapsed'
+		linesDecorationsClassName: 'codicon codicon-chevron-right'
 	});
 
 	private static EXPANDED_AUTO_HIDE_VISUAL_DECORATION = ModelDecorationOptions.register({
 		stickiness: TrackedRangeStickiness.NeverGrowsWhenTypingAtEdges,
-		linesDecorationsClassName: 'folding'
+		linesDecorationsClassName: 'codicon codicon-chevron-down'
 	});
 
 	private static EXPANDED_VISUAL_DECORATION = ModelDecorationOptions.register({
 		stickiness: TrackedRangeStickiness.NeverGrowsWhenTypingAtEdges,
-		linesDecorationsClassName: 'folding alwaysShowFoldIcons'
+		linesDecorationsClassName: 'codicon codicon-chevron-down alwaysShowFoldIcons'
 	});
 
 	public autoHideFoldingControls: boolean = true;