add collapsible SNI system tray, rename project to i3bar-mango

Tray: the bar acts as org.kde.StatusNotifierWatcher plus host (zbus),
rendering items on the right edge with icon/name; [tray] config toggles
expanded, show_icon, show_name, show_description. Clicks map to
Activate/SecondaryActivate/ContextMenu.

Rename: package, binary, config dir, layer-shell namespace and DBus
names are now i3bar-mango; mango is the default feature and the first
WM provider tried.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/button_manager.rs b/src/button_manager.rs
index 13f9124..9915460 100644
--- a/src/button_manager.rs
+++ b/src/button_manager.rs
@@ -1,6 +1,12 @@
-#[derive(Debug, Default)]
+#[derive(Debug)]
 pub struct ButtonManager<T = usize>(Vec<(f64, f64, T)>);
 
+impl<T> Default for ButtonManager<T> {
+    fn default() -> Self {
+        Self(Vec::new())
+    }
+}
+
 impl<T> ButtonManager<T> {
     pub fn push(&mut self, x_offset: f64, width: f64, elem: T) {
         self.0.push((x_offset, width, elem));