Bug 208098 [Markers] All content provider needs a type field
As All shows everything the type column would be very useful for filtering.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerEntry.java
int lineNumber = marker.getAttribute(IMarker.LINE_NUMBER, -1);
		String lineNumberString;
		if (lineNumber < 0)
			lineNumberString = MarkerMessages.Unknown;
		else
			lineNumberString = NLS.bind(MarkerMessages.label_lineNumber,
					Integer.toString(lineNumber));
		attributeCache.put(IMarker.LOCATION, lineNumberString);
		return lineNumberString;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.provisional.views.markers.api.MarkerItem#getMarker()
	 */
	public IMarker getMarker() {
		return marker;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.provisional.views.markers.MarkerItem#getMarkerTypeName()
	 */
	public String getMarkerTypeName() {
		try {
			return MarkerTypesModel.getInstance().getType(marker.getType())
					.getLabel();
		} catch (CoreException e) {
			return NLS.bind(MarkerMessages.FieldMessage_WrongType, marker.toString());
		}