Address some PR comments.

helix-core/src/textobject.rs

@@ -32,10 +32,9 @@ fn find_word_boundary(slice: RopeSlice, mut pos: usize, direction: Direction) ->
                 if category != prev_category && pos != 0 && pos != slice.len_chars() {
                     return pos;
                 } else {
-                    if direction == Direction::Forward {
+                    match direction {
-                        pos += 1;
+                        Direction::Forward => pos += 1,
-                    } else {
+                        Direction::Backward => pos = pos.saturating_sub(1),
-                        pos = pos.saturating_sub(1);
                     }
                     prev_category = category;
                 }

helix-view/src/view.rs

@@ -92,17 +92,17 @@ impl View {
         let line = pos.row;
         let col = pos.col;
         let height = self.area.height.saturating_sub(1); // - 1 for statusline
-        let last_line = self.first_line + height as usize;
+        let last_line = (self.first_line + height as usize).saturating_sub(1);
 
         let scrolloff = PADDING.min(self.area.height as usize / 2); // TODO: user pref
 
         // TODO: not ideal
         const OFFSET: usize = 7; // 1 diagnostic + 5 linenr + 1 gutter
-        let last_col = self.first_col + (self.area.width as usize - OFFSET);
+        let last_col = (self.first_col + self.area.width as usize).saturating_sub(OFFSET + 1);
 
-        if line > last_line.saturating_sub(scrolloff + 1) {
+        if line > last_line.saturating_sub(scrolloff) {
             // scroll down
-            self.first_line += line - (last_line.saturating_sub(scrolloff + 1));
+            self.first_line += line - (last_line.saturating_sub(scrolloff));
         } else if line < self.first_line + scrolloff {
             // scroll up
             self.first_line = line.saturating_sub(scrolloff);