Bug 82743 [Markers] improved problem filter needed (OR clauses)
when working with large workspaces I find the current problems filter not powerful enough. If I were able to AND and OR the conditions available from the UI then I would solve all my use cases. my most needed one is : I would like to see ERRORS anywhere in the workspace OR WARNINGS in the current selected project
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/DialogMarkerFilter.java
/**
     * Marks the dialog as dirty.
     */
    void markDirty() {
        dirty = true;
    }
    /**
     * Set the marker filter.
     * @param newFilter
     */
    public void setFilter(MarkerFilter newFilter) {
        filter = newFilter;
        updateUIFromFilter();
    }
    /**
     * @return the MarkerFilter associated with the dialog.
     */
    public MarkerFilter getFilter() {
        return filter;
    }
    /**
     * @return <code>true</code> if the filter's enablement button is checked 
     * otherwise <code>false</code>.
     */
    protected boolean isFilterEnabled() {
        return (filterEnabledButton == null)
                || filterEnabledButton.getSelection();
    }
}