fix titlebar drag region dbl-click (microsoft#167090)

fixes microsoft#159010

Author: sbatten

src/vs/workbench/browser/parts/titlebar/titlebarPart.ts

@@ -232,9 +232,6 @@ export class TitlebarPart extends Part implements ITitleService {
 		this.element = parent;
 		this.rootContainer = append(parent, $('.titlebar-container'));
 
-		// Draggable region that we can manipulate for #52522
-		this.dragRegion = prepend(this.rootContainer, $('div.titlebar-drag-region'));
-
 		// App Icon (Native Windows/Linux and Web)
 		if (!isMacintosh && !isWeb) {
 			this.appIcon = prepend(this.rootContainer, $('a.window-appicon'));
@@ -254,6 +251,9 @@ export class TitlebarPart extends Part implements ITitleService {
 			}
 		}
 
+		// Draggable region that we can manipulate for #52522
+		this.dragRegion = prepend(this.rootContainer, $('div.titlebar-drag-region'));
+
 		// Menubar: install a custom menu bar depending on configuration
 		// and when not in activity bar
 		if (this.titleBarStyle !== 'native'