Bug 319961 Reset perspective fails with parts moved into the editor area
1. Start a fresh e4 workbench 2. Move the Javadoc view into the editor area 3. Reset the perspective 4. Open the Javadoc view Result: The Javadoc view is opened in the editor area. In the bottom stack there still is a tab for the Javadoc view; this tab can be clicked, but it will activate the view in the editor area. The toolbar, however, is shown in the bottom stack.
bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/dndaddon/DnDManager.java
}
	private DragAgent getDragAgent(CursorInfo info) {
		for (DragAgent agent : dragAgents) {
			if (agent.canDrag(info))
				return agent;
		}
		return null;
	}
	private DropAgent getDropAgent(MUIElement dragElement, CursorInfo info) {
		for (DropAgent agent : dropAgents) {
			if (agent.canDrop(dragElement, info))
				return agent;
		}
		return null;
	}
	public void setDisplayFilters(boolean enable) {
		if (enable) {
			display.addFilter(SWT.MouseMove, mouseMoveListener);
			display.addFilter(SWT.MouseDown, mouseButtonListener);
			display.addFilter(SWT.MouseUp, mouseButtonListener);
			display.addFilter(SWT.KeyDown, keyListener);
		} else {
			display.removeFilter(SWT.MouseMove, mouseMoveListener);
			display.removeFilter(SWT.MouseDown, mouseButtonListener);
			display.removeFilter(SWT.MouseUp, mouseButtonListener);
			display.removeFilter(SWT.KeyDown, keyListener);
		}
	}
}