Causes WSOD when In-place editor renderer is enabled

Having the same issue and requirement. It would be great to allow multilingual support with the in-place-editor plugin. The only way I can see this working at the moment is to create another plugin that extends from the IPE plugin integrating the methods from this plugin. This request is also a duplicate of #1971954: Problem. Is there any active development on this project? Would be good to get some dev work started on this as our project will definitely need this in the future. But initially it would be good to remove the above error to allow for a choice between multilingual and the IPE plugin.

This issue actually breaks Aegir management of the site too -- it's an early registry error that kills the site.

I would expect the cause is simply that the requisite includes/ctools includes have not happened by the time MLPanels asks for them. I've not yet had chance to delve into this, but it's clear a reference or include is missing from this module's code.

Marking as critical as it's a site killer.

OK so I've got a bit of a hacky fix for this... Basically the cause is that the MLPanels module blindly includes the class file for the 'panels_renderer_editor' renderer it wants to override, but that class inherits another "panels_renderer_standard", which is not loaded.

This causes (for me) a similar error that does not rely on Panels IPE to cause it...:

$ drush6 @test.aegir.local rr
Drush command terminated abnormally due to an unrecoverable error.     [error]
Error: Class 'panels_renderer_standard' not found in [docroot]/sites/all/modules/contrib/panels/plugins/display_renderers/panels_renderer_editor.class.php, line 8

The cause is in mlpanels_ctools_plugin_pre_alter() in mlpanels.module at line 55. In here it's trying to force the 'editor' renderer to use its own, so (as outlined above) it tries to load that class which needs another ("panels_renderer_standard") that is not loaded in all cases.

I fixed -- EDIT kinda fixed --- the error on my site by adding a line to load the appropriate class when it's overriding the panels 'editor' renderer plugin... Starting line 63 I replaced:

    // Preload all nessesary files.
    require_once $plugin['path'] . '/' . $plugin['renderer'] . '.class.php';

With a sanity check and also the required renderer inheritied class:

    // Preload all necessary files.
    if ($plugin['module'] == 'panels') {
      require_once $plugin['path'] . '/panels_renderer_standard.class.php';
      require_once $plugin['path'] . '/' . $plugin['renderer'] . '.class.php';
    }

Now this whole thing feels hacky since we're not using CTools or Drupal to include the appropriate class AND pre-requisites, BUT it works!

--- EDIT: This worked on one site but not another... Hmmm... ---

I'm hoping this helps others so we can get their thoughts as to a proper solution... Perhaps this question needs to be asked over in the Panels or CTools issue queue -- and fundamentally that question is: "How do we safely include the Panels renderer AND its prerequisites at a time the system is preparing CTools plugin information?"

Of course it's possible that the question above is wrong because the current approach used by this module isn't ideal, and using a different approach when overriding the 'editor' renderer class might be a better move.

I think the problem I've got is related to this, I don't get WSOD but I am getting the error

Plugin editor of plugin type panels:display_renderers points to nonexistent file sites/all/modules/panels/plugins/display_renderers/mlpanels_panels_renderer_editor.class.php for class handler renderer.

Indeed it does as it's in sites/all/modules/mlpanels and also in sites/all/modules/mlpanels/plugins/display_renderers

Should I try the patch or should I copy the file into the panels directory or is there another better solution?

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For temporary workaround for site management in Aegir (and perhaps for other cases as well), you can disable the multilingual panels module before cloning or migrating the site, and then reenable it once clone or migration is complete.

WSOD is fixed in 7.x-1.3 (at least for me), but seems like this module is exclusive with IPE, and i don't see any way to make them both works except add another renderer option like "IPE multilingual" and extend IPE class, resulting class will looks rather hacky.

IPE support may be included in future but not in nearest month.