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
/**
     */
    private void filterResources() {
        String oldPattern = patternString;
        patternString = adjustPattern();
        if (patternString.equals(oldPattern))
            return;
        updateFilterThread.stop = true;
        stringMatcher = new StringMatcher(patternString, true, false);
        UpdateFilterThread oldThread = updateFilterThread;
        updateFilterThread = new UpdateFilterThread();
        if (patternString.equals("")) { 
            updateFilterThread.firstMatch = 0;
            updateFilterThread.lastMatch = -1;
            updateFilterThread.start();
            return;
        }
        if (oldPattern != null && (oldPattern.length() != 0)
                && oldPattern.endsWith("*") && patternString.endsWith("*")) { 
            int matchLength = oldPattern.length() - 1;
            if (patternString.regionMatches(0, oldPattern, 0, matchLength)) {
                 
                
                updateFilterThread.firstMatch = oldThread.firstMatch;
                updateFilterThread.lastMatch = oldThread.lastMatch;
                updateFilterThread.start();
                return;
            }
        }