Navigated back handing base

src/repetitions.rs

@@ -58,6 +58,10 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
             None
         }
     }
+
+    fn navigated(&mut self) {
+        self.selected_set = None;
+    }
 }
 
 impl RepetitionsState {
@@ -273,9 +277,12 @@ impl RepetitionsState {
 
         if let Some(history) = history {
             for (date, activity) in history {
-                let distance = *date - now;
+                let distance = now - *date;
                 let index = counts.len() as i64 - distance.num_days() - 1;
 
+                if index == 210 {
+                    println!("invalid index")
+                }
                 if index < 0 {
                     continue;
                 }