Bug 313106 [CommonNavigator] Regression: Show In > Project Explorer removes selection after setting it
N20100516-2000, broken since 3.6 M7, works in R3.5.x. First Show In > Project Explorer removes selection after setting it. 1. start with new workspace 2. switch to 'Resource' perspective 3. close the 'Project Explorer' 4. open the 'Navigator' 5. create a simple project 'P' 6. Navigate > Show In > Project Explorer ==> selection is set in the 'Project Explorer' but immediately removed afterwards Should fix for 3.6 since Show In > is broken
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorFilterService.java
*            The filter ids to activate.
	 */
	public void addActiveFilterIds(String[] theFilterIds) {
		Assert.isNotNull(theFilterIds);
		synchronized (activeFilters) {
			activeFilters.addAll(Arrays.asList(theFilterIds));
		}
	}
	
	/**
	 * 
	 * @param aFilterId The id of the filter to activate or deactivate
	 * @param toMakeActive True to make the filter active, false to make the filter inactive
	 */
	public void setActive(String aFilterId, boolean toMakeActive) {
		synchronized (activeFilters) {
			boolean isActive = activeFilters.contains(aFilterId);
			if(isActive ^ toMakeActive) {
				if(toMakeActive)
					activeFilters.remove(aFilterId);
				else
					activeFilters.add(aFilterId);
					
			}
				
		}
	}
 
}