Reenable and update code for attached, full pane message composer.
Display attached+un-embedded composer as an additional ConversationViewer stack page, although it realy should be broken as its own top-level widget - there's already too much state in ConversationViewer. * src/client/conversation-viewer/conversation-viewer.vala: Remove old composer boxes code. Add new ViewState enum, property and methods to define and manipulate the current view state - either conversation or composer. (do_conversation): New method to put the viewer in conversation mode. (do_compose): New method to put the viewer in compose mode, hook up the composer widget, and handle ConversationListView selection management for now. (on_folder_selected, on_conversation_count_changed, on_conversations_selected): Ensure these methods do the right thing depending on the viewer's current view state. (set_paned_composer): Replaced by ::do_compose, fixed call sites. (show_multiple_selected): Minor code clean up - moved down to a more appropriate location. * src/client/composer/composer-box.vala (ComposerBox): Don't attempt to up-manage it's parent's state, since the parent has a much better idea of how best to do that. Likewise move code to manage previous ConversationList selection out, provide signal so the a more appropriate class can manage it instead. * src/client/composer/composer-container.vala: Add some method comments. * ui/conversation-viewer.ui: Add new page to the stack for the composer.
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