Supports view progress in merged header & panel

src/vs/workbench/browser/parts/sidebar/media/sidebarpart.css

@@ -3,9 +3,10 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-.monaco-workbench .sidebar > .content {
+/* Removed to allow progress bar positioning to escape */
+/* .monaco-workbench .sidebar > .content {
 	overflow: hidden;
-}
+} */
 
 .monaco-workbench.nosidebar > .part.sidebar {
 	display: none !important;

src/vs/workbench/browser/parts/views/media/paneviewlet.css

@@ -28,10 +28,14 @@
 	margin-left: 7px;
 }
 
-.monaco-pane-view .pane > .pane-header .monaco-progress-container {
+.monaco-pane-view .pane .monaco-progress-container {
 	position: absolute;
 	left: 0;
-	bottom: 0;
+	top: -2px;
 	z-index: 5;
 	height: 2px;
 }
+
+.monaco-pane-view .pane:not(.merged-header) .monaco-progress-container {
+	top: 20px;
+}

src/vs/workbench/browser/parts/views/viewPaneContainer.ts

@@ -225,6 +225,15 @@ export abstract class ViewPane extends Pane implements IView {
 		this.viewWelcomeController = new ViewWelcomeController(this.id, contextKeyService);
 	}
 
+	get headerVisible(): boolean {
+		return super.headerVisible;
+	}
+
+	set headerVisible(visible: boolean) {
+		super.headerVisible = visible;
+		toggleClass(this.element, 'merged-header', !visible);
+	}
+
 	setVisible(visible: boolean): void {
 		if (this._isVisible !== visible) {
 			this._isVisible = visible;
@@ -294,13 +303,6 @@ export abstract class ViewPane extends Pane implements IView {
 		const onDidRelevantConfigurationChange = Event.filter(this.configurationService.onDidChangeConfiguration, e => e.affectsConfiguration(ViewPane.AlwaysShowActionsConfig));
 		this._register(onDidRelevantConfigurationChange(this.updateActionsVisibility, this));
 		this.updateActionsVisibility();
-
-		if (this.progressBar !== undefined) {
-			// Progress bar
-			this.progressBar = this._register(new ProgressBar(this.headerContainer));
-			this._register(attachProgressBarStyler(this.progressBar, this.themeService));
-			this.progressBar.hide();
-		}
 	}
 
 	protected renderTwisties(container: HTMLElement): void {
@@ -333,13 +335,9 @@ export abstract class ViewPane extends Pane implements IView {
 	}
 
 	getProgressIndicator() {
-		if (!this.headerContainer) {
-			return undefined;
-		}
-
 		if (this.progressBar === undefined) {
 			// Progress bar
-			this.progressBar = this._register(new ProgressBar(this.headerContainer));
+			this.progressBar = this._register(new ProgressBar(this.element));
 			this._register(attachProgressBarStyler(this.progressBar, this.themeService));
 			this.progressBar.hide();
 		}