Plugin state conflict when plugin installed at same time as plugin state is checked.

2008-11-26 18:58:59,615 WARN [TP-Processor4144] [com.atlassian.plugin.DefaultPluginManager] isPluginEnabled Plugin com.atlassian.confluence.extra.widgetconnector is out of sync with the plugin system, disabling
 -- url: /plugins/pagetree/naturalchildren.action | userName: anonymous | referer: http://confluence.atlassian.com/pages/viewpage.action?pageId=58656151
2008-11-26 18:59:01,995 WARN [TP-Processor3849] [com.atlassian.plugin.DefaultPluginManager] isPluginEnabled Plugin com.atlassian.confluence.extra.widgetconnector is out of sync with the plugin system, disabling
 -- url: /display/DOC/Displaying+an+Image | page: 139500 | userName: anonymous | referer: http://confluence.atlassian.com/display/DOC/Attaching+Files+to+a+Page | action: viewpage

150.101.48.40 - - [26/Nov/2008:18:58:59 -0600] "GET /plugins/pagetree/naturalchildren.action?decorator=none&excerpt=false&sort=position&reverse=false&disableLinks=false&hasRoot=true&pageId=16482400&treeId=1&startDepth=0&ancestors=58656083&ancestors=58656009&ancestors=16482400 HTTP/1.1" 200 1172 "http://con
fluence.atlassian.com/pages/viewpage.action?pageId=58656151" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-GB; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4" 234580
70.102.8.226 - - [26/Nov/2008:18:59:01 -0600] "GET /display/DOC/Displaying+an+Image HTTP/1.1" 200 14848 "http://confluence.atlassian.com/display/DOC/Attaching+Files+to+a+Page" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3" 2097546
70.102.8.226 - - [26/Nov/2008:18:59:04 -0600] "GET /s/1513/13/1.0/_/download/resources/confluence.web.resources%3Adwr/engine.js HTTP/1.1" 200 11911 "http://confluence.atlassian.com/display/DOC/Displaying+an+Image" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3" 
28176
203.63.130.33 - - [26/Nov/2008:18:58:58 -0600] "POST /plugins/servlet/plugin-repository/dwr/exec/RepositoryDWR.installPlugin.dwr HTTP/1.1" 200 1127 "http://confluence.atlassian.com/admin/plugin-repository/plugins.action" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-GB; rv:1.9.0.4) Gecko/2008102920 F
irefox/3.0.4" 5506545
203.63.130.33 - - [26/Nov/2008:18:59:04 -0600] "POST /plugins/servlet/plugin-repository/dwr/exec/RepositoryDWR.getTransferStatus.dwr HTTP/1.1" 200 182 "http://confluence.atlassian.com/admin/plugin-repository/plugins.action" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-GB; rv:1.9.0.4) Gecko/200810292
0 Firefox/3.0.4" 107425

public boolean isPluginEnabled(String key)
    {
        Plugin plugin = plugins.get(key);

        boolean shouldBeEnabled = plugin != null && getState().isEnabled(plugin);

        // Detect if the plugin state is out of sync with the plugin state store
        if (shouldBeEnabled && !plugin.isEnabled())
        {
            log.warn("Plugin "+key+" is out of sync with the plugin system, disabling");
            // Just changing the state in the store to prevent a stack overflow as disabling modules requires the
            // plugin to be enabled, thus calling this method in a infinite loop.
            disablePluginState(plugin, getStore());
            shouldBeEnabled = false;
        }
        return shouldBeEnabled;
    }

public final AtlassianPlugin installPlugin(File pluginFile,
            String pluginLocation,
            boolean suppressKeyChecks,
            boolean suppressVersionChecks,
            String pluginKey,
            Version version) throws RepositoryException
    {
        try
        {
            // Get the plugin manager
            PluginAccessor pluginAccessor = getPluginAccessor();
            
            checkPluginFile(pluginFile, pluginLocation, suppressKeyChecks,suppressVersionChecks, pluginKey, version);

            // Check for an existing plugin
            Plugin existingPlugin = pluginAccessor.getPlugin(pluginKey);
            if (existingPlugin != null && !existingPlugin.isBundledPlugin())
            {
                // upgradePlugin should have been called, but wasn't.  do the right thing anyways
                return upgrade(existingPlugin, pluginFile);
            }
            // Install the plugin
            return install(pluginFile, pluginKey, version);
        }
        finally
        {
            pluginFile.delete();
        }
    }