Bug 73769 [Dialogs] Open Resource dialog has OK enabled when entry invalid
3.0.1 RC2 - Ctrl+Shift+R - type: WorkbenchWino (note the missing d) and hit Enter - the dialog is dismissed with no action Should disable OK if there is no match.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/ResourceListSelectionDialog.java
updateFilterThread.firstMatch = 0;
        updateFilterThread.lastMatch = descriptorsSize - 1;
        updateFilterThread.start();
    }
    /**
     * Use a binary search to get the first match for the patternString.
     * This method assumes the patternString does not contain any '?' 
     * characters and that it contains only one '*' character at the end
     * of the string.
     */
    private int getFirstMatch() {
        int high = descriptorsSize;
        int low = -1;
        boolean match = false;
        ResourceDescriptor desc = new ResourceDescriptor();
        desc.label = patternString.substring(0, patternString.length() - 1);
        while (high - low > 1) {
            int index = (high + low) / 2;
            String label = descriptors[index].label;
            if (match(label)) {
                high = index;
                match = true;
            } else {
                int compare = descriptors[index].compareTo(desc);
                if (compare == -1) {
                    low = index;
                } else {
                    high = index;
                }
            }