Remove WidgetRet::Quit and TUIRet::Quit:

These values are the same as the `WidgetRet::Command` and
`TUIRet::Command` for the `/quit` command.

Replace them with the `Command` variants to avoid representing the same
thing in multiple ways.

crates/libtiny_tui/src/exit_dialogue.rs

@@ -50,7 +50,7 @@ impl ExitDialogue {
 
     pub(crate) fn keypressed(&self, key_action: &KeyAction) -> WidgetRet {
         match key_action {
-            KeyAction::Input('y') | KeyAction::InputSend => WidgetRet::Quit,
+            KeyAction::Input('y') | KeyAction::InputSend => WidgetRet::Command("quit".to_string()),
             _ => WidgetRet::Remove,
         }
     }

crates/libtiny_tui/src/lib.rs

@@ -172,12 +172,6 @@ async fn input_handler<S>(
             Some(Ok(ev)) => {
                 let tui_ret = tui.borrow_mut().handle_input_event(ev, &mut rcv_editor_ret);
                 match tui_ret {
-                    Some(TUIRet::Quit) => {
-                        snd_ev.try_send(Event::Quit { msg: None }).unwrap();
-                        let _ = snd_abort.try_send(());
-                        return;
-                    }
-
                     Some(TUIRet::KeyCommand { cmd, from }) => {
                         let result = tui.borrow_mut().try_handle_cmd(&cmd, &from);
                         match result {

crates/libtiny_tui/src/tui.rs

@@ -28,9 +28,6 @@ use termbox_simple::{CellBuf, Termbox};
 
 #[derive(Debug)]
 pub(crate) enum TUIRet {
-    /// User wants to quit.
-    Quit,
-
     /// A command was submitted, either directly, or via a key bound to a command.
     ///
     /// `cmd` won't have an initial '/'.
@@ -690,8 +687,6 @@ impl TUI {
             }),
 
             WidgetRet::Remove => unimplemented!(),
-
-            WidgetRet::Quit => Some(TUIRet::Quit),
         }
     }
 

crates/libtiny_tui/src/widget.rs

@@ -13,7 +13,4 @@ pub(crate) enum WidgetRet {
 
     /// Remove the widget. E.g. close the tab, hide the dialogue etc.
     Remove,
-
-    /// User wants to quit, i.e. pressed `C-c <enter>` or a key bound to the `/quit` command.
-    Quit,
 }