fix calculation of the number of files when toggling hidden files

src/files.rs

@@ -550,11 +550,10 @@ impl Files {
         self.set_dirty();
 
         if self.show_hidden == true && self.len() > 1 {
-            self.remove_placeholder();
+            self.remove_placeholder()
-        } else {
-            // avoid doing this twice, since remove_placeholder() does it too
-            self.recalculate_len();
         }
+
+        self.recalculate_len();
     }
 
     fn remove_placeholder(&mut self) {
@@ -562,7 +561,9 @@ impl Files {
         self.find_file_with_path(&dirpath).cloned()
             .map(|placeholder| {
                 self.files.remove_item(&placeholder);
-                self.recalculate_len();
+                if self.len > 0 {
+                    self.len -= 1;
+                }
             });
     }
 
@@ -895,7 +896,8 @@ impl File {
                 .map(|dirs| {
                     let size = dirs.count();
                     dirsize.store(size as u32, Ordering::Release);
-                });
+                }).map_err(HError::from)
+                  .log();
         });
     }
 

src/listview.rs

@@ -987,9 +987,11 @@ where
             .map(|(i, item)| {
                 let mut output = term::normal_color();
 
-                if i == (self.selection - self.offset) {
+                // i counts from the offset, while selection counts from 0
+                if i + self.offset == self.selection {
                     output += &term::invert();
                 }
+
                 output += &format!(
                     "{}{}{}",
                     term::goto_xy(xpos, i as u16 + ypos),