feat(explorer): bind "="/"_" to "Zoom in"/"Zoom out"

changes

@@ -29,6 +29,7 @@ TODO
 - [x] refactor, add tree.expand_children() method
 
 New:
+- [x] increase indentation
 - [x] Change '[' to "go to previous root"
 - [x] Change 'b' to "go to parent"
 - [x] Use C-o for jumping to previous position
@@ -44,6 +45,7 @@ New:
 - [x] add integration test for Explorer
 - [x] bind "o" to open/close file/folder
 - [x] bind "C-n/C-p" to up/down
+- [x] bind "="/"_" to zoom-in/zoom-out
 - [] search highlight matching word
 - [] Error didn't clear
 - [] should preview be there by default?

helix-term/src/ui/explorer.rs

@@ -797,8 +797,8 @@ impl Component for Explorer {
                 key!('[') => self.go_to_previous_root(),
                 key!('d') => self.new_remove_prompt()?,
                 key!('r') => self.new_rename_prompt(cx),
-                key!('-') => self.decrease_size(),
-                key!('+') => self.increase_size(),
+                key!('-') | key!('_') => self.decrease_size(),
+                key!('+') | key!('=') => self.increase_size(),
                 _ => {
                     self.tree
                         .handle_event(&Event::Key(*key_event), cx, &mut self.state, &filter);

helix-term/src/ui/tree.rs

@@ -662,7 +662,10 @@ impl<T: TreeViewItem> TreeView<T> {
 
     fn move_right(&mut self, cols: usize) {
         self.pre_render = Some(Box::new(move |tree, area| {
-            let max_scroll = tree.max_len.saturating_sub(area.width as usize);
+            let max_scroll = tree
+                .max_len
+                .saturating_sub(area.width as usize)
+                .saturating_add(1);
             tree.column = max_scroll.min(tree.column + cols);
         }));
     }