Feature request: hybrid widescreen + correspondence view

Make sure you save the file in the correct location:

~/Library/Application Support/MailMate/Resources/Layouts/Mailboxes/WideCorrespondence.plist

You cannot inject the message view since then it does not display what is selected in the correspondence list. Also, the layout system isn't perfect and some setups don't work well, but I believe the following works (based on what I got from another user):

Make sure you use the latest test release for this.

{
    name = "Wide Correspondence";
    rootViewer =
    {
        viewerType = "MmSplitView";
        orientation = "horizontal";
        children =
        (
            {
                viewerType = "MmBoxView";
                orientation = "vertical";
                defaultSize = 200;
                minWidth = 100;
                autoresize = 0;
                toggleMenuTitle = "Mailboxes";
                toggleKeyEquivalent = "^~@d";

                dragRect = { width = 16.0; height = 16.0; location = "bottomRight"; };

                children =
                (
                    {
                        identifier = "mailboxesOutline";
                        viewerType = "MmMailboxesOutlineView";
                        stickyMessages = 1;
                    },
                    {
                        viewerType = "MmMailboxesStatusBar";
                    },
                );
            },
            {
                viewerType = "MmSplitView";
                orientation = "vertical";
                collapsibleSubview = 2; // Incomplete support -- no way to get it back (1 = first, 2 = last)
                children =
                (
                    {
                        identifier = "pathOutlineBox";
                        viewerType = "MmBoxView";
                        orientation = "vertical";
                        defaultSize = 250;
                        autoresize = 0;
                        children =
                        (
                            {
                                identifier = "pathControl";
                                viewerType = "MmPathControlView";
                                sources = ( { sourceIdentifier = "mailboxesOutline"; } );
                            },
                            {
                                identifier = "mainOutline";
                                viewerType = "MmMessagesOutlineView";
                                // columnSettings = "outlineColumns";
                                // Keeps selected messages in the view even if they no longer match the main query
                                // sources = ( { sourceIdentifier = "mainOutline"; }, { sourceIdentifier = "pathControl"; } );
                                sources = ( { sourceIdentifier = "pathControl"; } );
                                minHeight = 50;
                            },
                        );
                    },
                    {
                        viewerType = "MmBoxView";
                        orientation = "vertical";
                        defaultSize = 200;
                        autoresize = 0;
                        children =
                        (
                            {
                                viewerType = "MmLabelView";
                                label = "Correspondence";
                            },
                            {
                                identifier = "correspondenceOutline";
                                viewerType = "MmMessagesOutlineView";
                                minWidth = 100;
                                sources = ( { sourceIdentifier = "mainOutline"; } );
                                selectionSources = ( { sourceIdentifier = "mainOutline"; } );
                                // FIXME: The transformation does not work 'per' message, i.e., it tries to combine any 'from' with any 'to' in $mainOutline.
                                transformation = "$ALL_MESSAGES.filter((from.address = $mainOutline.from.address and #recipient.address = $mainOutline.#recipient.address) or (from.address = $mainOutline.#recipient.address and #recipient.address = $mainOutline.from.address))";
                                defaultColumns = ( "subject", "relativeDate" );
                                outlineColumn = "subject";
                            },
                        );

                        toggleMenuTitle = "Correspondence View";
                        toggleKeyEquivalent = "^~@c";
                    },
                );
            },
            {
                viewerType = "MmBoxView";
                orientation = "vertical";
                children =
                (
                    {
                        identifier = "tagsEditor";
                        viewerType = "MmTagsEditor";
                        sources = ( { sourceIdentifier = "correspondenceOutline"; } );
                    },
                    {
                        viewerType = "MmMultiMessageView";
                        identifier = "messageView";
                        minHeight = 150;
                        minWidth = 250;
                        sources = ( { sourceIdentifier = "correspondenceOutline"; } );
                    },
                );

                toggleMenuTitle = "Message View";
                toggleKeyEquivalent = "^~@h";
            }
        );
    };
}