Removes unused import

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

@@ -9,7 +9,7 @@ import { Event, Emitter } from 'vs/base/common/event';
 import { ColorIdentifier, activeContrastBorder, foreground } from 'vs/platform/theme/common/colorRegistry';
 import { attachStyler, IColorMapping, attachButtonStyler, attachLinkStyler, attachProgressBarStyler } from 'vs/platform/theme/common/styler';
 import { SIDE_BAR_DRAG_AND_DROP_BACKGROUND, SIDE_BAR_SECTION_HEADER_FOREGROUND, SIDE_BAR_SECTION_HEADER_BACKGROUND, SIDE_BAR_SECTION_HEADER_BORDER, PANEL_BACKGROUND, SIDE_BAR_BACKGROUND, PANEL_SECTION_HEADER_FOREGROUND, PANEL_SECTION_HEADER_BACKGROUND, PANEL_SECTION_HEADER_BORDER, PANEL_SECTION_DRAG_AND_DROP_BACKGROUND, PANEL_SECTION_BORDER } from 'vs/workbench/common/theme';
-import { after, append, prepend, $, trackFocus, toggleClass, EventType, isAncestor, Dimension, addDisposableListener, removeClass, addClass, createCSSRule, asCSSUrl, addClasses } from 'vs/base/browser/dom';
+import { after, append, $, trackFocus, toggleClass, EventType, isAncestor, Dimension, addDisposableListener, removeClass, addClass, createCSSRule, asCSSUrl, addClasses } from 'vs/base/browser/dom';
 import { IDisposable, combinedDisposable, dispose, toDisposable, Disposable, DisposableStore } from 'vs/base/common/lifecycle';
 import { firstIndex } from 'vs/base/common/arrays';
 import { IAction, Separator, IActionViewItem } from 'vs/base/common/actions';