src/: Box<_> some large fields in biggest types

As reported by `cargo +nightly typesize`

src/components/mail/listing.rs

@@ -84,9 +84,9 @@ impl Default for Modifier {
 
 #[derive(Debug, Default, Clone)]
 pub struct DataColumns {
-    pub columns: [CellBuffer; 12],
+    pub columns: Box<[CellBuffer; 12]>,
     pub widths: [usize; 12], // widths of columns calculated in first draw and after size changes
-    pub segment_tree: [SegmentTree; 12],
+    pub segment_tree: Box<[SegmentTree; 12]>,
 }
 
 #[derive(Debug, Default)]

src/components/mail/listing/compact.rs

@@ -188,7 +188,7 @@ pub struct CompactListing {
     force_draw: bool,
     /// If `self.view` exists or not.
     focus: Focus,
-    view: ThreadView,
+    view: Box<ThreadView>,
     row_updates: SmallVec<[ThreadHash; 8]>,
     color_cache: ColorCache,
 
@@ -307,7 +307,7 @@ impl MailListingTrait for CompactListing {
         } else if self.unfocused() {
             let thread = self.get_thread_under_cursor(self.cursor_pos.2);
 
-            self.view = ThreadView::new(self.new_cursor_pos, thread, None, context);
+            self.view = Box::new(ThreadView::new(self.new_cursor_pos, thread, None, context));
         }
     }
 
@@ -491,7 +491,7 @@ impl ListingTrait for CompactListing {
     fn set_coordinates(&mut self, coordinates: (AccountHash, MailboxHash)) {
         self.new_cursor_pos = (coordinates.0, coordinates.1, 0);
         self.focus = Focus::None;
-        self.view = ThreadView::default();
+        self.view = Box::new(ThreadView::default());
         self.filtered_selection.clear();
         self.filtered_order.clear();
         self.filter_term.clear();
@@ -897,7 +897,7 @@ impl CompactListing {
             rows: vec![],
             dirty: true,
             force_draw: true,
-            view: ThreadView::default(),
+            view: Box::new(ThreadView::default()),
             color_cache: ColorCache::default(),
             movement: None,
             modifier_active: false,
@@ -1785,7 +1785,7 @@ impl Component for CompactListing {
                             || shortcut!(k == shortcuts[Listing::DESCRIPTION]["focus_right"])) =>
                 {
                     let thread = self.get_thread_under_cursor(self.cursor_pos.2);
-                    self.view = ThreadView::new(self.cursor_pos, thread, None, context);
+                    self.view = Box::new(ThreadView::new(self.cursor_pos, thread, None, context));
                     self.set_focus(Focus::Entry, context);
                     return true;
                 }

src/components/mail/listing/thread.rs

@@ -131,7 +131,7 @@ pub struct ThreadListing {
     /// If `self.view` is focused or not.
     focus: Focus,
     initialised: bool,
-    view: Option<MailView>,
+    view: Option<Box<MailView>>,
     movement: Option<PageMovement>,
     id: ComponentId,
 }
@@ -773,7 +773,7 @@ impl ListingTrait for ThreadListing {
                 if let Some(ref mut v) = self.view {
                     v.update(coordinates, context);
                 } else {
-                    self.view = Some(MailView::new(coordinates, None, None, context));
+                    self.view = Some(Box::new(MailView::new(coordinates, None, None, context)));
                 }
 
                 if let Some(ref mut s) = self.view {
@@ -1239,7 +1239,7 @@ impl Component for ThreadListing {
             if let Some(ref mut v) = self.view {
                 v.update(coordinates, context);
             } else {
-                self.view = Some(MailView::new(coordinates, None, None, context));
+                self.view = Some(Box::new(MailView::new(coordinates, None, None, context)));
             }
 
             if let Some(v) = self.view.as_mut() {

src/state.rs

@@ -97,7 +97,7 @@ impl InputHandler {
 /// A context container for loaded settings, accounts, UI changes, etc.
 pub struct Context {
     pub accounts: IndexMap<AccountHash, Account>,
-    pub settings: Settings,
+    pub settings: Box<Settings>,
 
     /// Areas of the screen that must be redrawn in the next render
     pub dirty_areas: VecDeque<Area>,
@@ -168,13 +168,13 @@ impl Context {
 /// A State object to manage and own components and components of the UI. `State` is responsible for
 /// managing the terminal and interfacing with `melib`
 pub struct State {
-    screen: Screen,
+    screen: Box<Screen>,
     draw_rate_limit: RateLimit,
     child: Option<ForkType>,
     pub mode: UIMode,
     overlay: Vec<Box<dyn Component>>,
     components: Vec<Box<dyn Component>>,
-    pub context: Context,
+    pub context: Box<Context>,
     timer: thread::JoinHandle<()>,
 
     display_messages: SmallVec<[DisplayMessage; 8]>,
@@ -228,11 +228,11 @@ impl State {
         let input_thread_pipe = nix::unistd::pipe()
             .map_err(|err| Box::new(err) as Box<dyn std::error::Error + Send + Sync + 'static>)?;
         let backends = Backends::new();
-        let settings = if let Some(settings) = settings {
+        let settings = Box::new(if let Some(settings) = settings {
             settings
         } else {
             Settings::new()?
-        };
+        });
         /*
         let mut plugin_manager = PluginManager::new();
         for (_, p) in settings.plugins.clone() {
@@ -307,7 +307,7 @@ impl State {
         let working = Arc::new(());
         let control = Arc::downgrade(&working);
         let mut s = State {
-            screen: Screen {
+            screen: Box::new(Screen {
                 cols,
                 rows,
                 grid: CellBuffer::new(cols, rows, Cell::with_char(' ')),
@@ -319,7 +319,7 @@ impl State {
                 } else {
                     Screen::draw_horizontal_segment_no_color
                 },
-            },
+            }),
             child: None,
             mode: UIMode::Normal,
             components: Vec::with_capacity(8),
@@ -333,7 +333,7 @@ impl State {
             display_messages_dirty: false,
             display_messages_initialised: false,
             display_messages_area: ((0, 0), (0, 0)),
-            context: Context {
+            context: Box::new(Context {
                 accounts,
                 settings,
                 dirty_areas: VecDeque::with_capacity(5),
@@ -351,7 +351,7 @@ impl State {
                 },
                 sender,
                 receiver,
-            },
+            }),
         };
         if s.context.settings.terminal.ascii_drawing {
             s.screen.grid.set_ascii_drawing(true);
@@ -395,7 +395,7 @@ impl State {
             }
             let Context {
                 ref mut accounts, ..
-            } = &mut self.context;
+            } = &mut *self.context;
 
             if let Some(notification) = accounts[&account_hash].reload(event, mailbox_hash) {
                 if let UIEvent::Notification(_, _, _) = notification {
@@ -948,10 +948,10 @@ impl State {
                             if toml::Value::try_from(&new_settings) == toml::Value::try_from(&self.context.settings) {
                                 return Err("No changes detected.".into());
                             }
-                            Ok(new_settings)
+                            Ok(Box::new(new_settings))
                         }) {
                             Ok(new_settings) => {
-                                let old_settings = Box::new(std::mem::replace(&mut self.context.settings, new_settings));
+                                let old_settings = std::mem::replace(&mut self.context.settings, new_settings);
                                 self.context.replies.push_back(UIEvent::ConfigReload {
                                     old_settings
                                 });

src/terminal.rs

@@ -463,6 +463,7 @@ pub mod screen {
     use termion::{clear, cursor};
     pub type StateStdout =
         termion::screen::AlternateScreen<termion::raw::RawTerminal<BufWriter<std::io::Stdout>>>;
+
     pub struct Screen {
         pub cols: usize,
         pub rows: usize,