Fix jump behavior, goto_implementation now jump

Better jump behavior since we override the first jump if it's on the
first document. At the same time, ctrl-i is now working with gd jumps.

helix-term/src/commands.rs

@@ -1308,7 +1308,7 @@ pub fn normal_mode(cx: &mut Context) {
 // Store a jump on the jumplist.
 fn push_jump(editor: &mut Editor) {
     let (view, doc) = editor.current();
-    let jump = { (doc.id(), doc.selection(view.id).clone()) };
+    let jump = (doc.id(), doc.selection(view.id).clone());
     view.jumps.push(jump);
 }
 
@@ -2446,7 +2446,7 @@ pub fn jump_backward(cx: &mut Context) {
     let count = cx.count();
     let (view, doc) = cx.current();
 
-    if let Some((id, selection)) = view.jumps.backward(count) {
+    if let Some((id, selection)) = view.jumps.backward(view.id, doc, count) {
         view.doc = *id;
         let selection = selection.clone();
         let (view, doc) = cx.current(); // refetch doc

helix-term/src/keymap.rs

@@ -280,7 +280,10 @@ pub fn default() -> Keymaps {
 
         // z family for save/restore/combine from/to sels from register
 
-        ctrl!('i') => commands::jump_forward, // TODO: ctrl-i conflicts tab
+        KeyEvent { // supposedly ctrl!('i') but did not work
+            code: KeyCode::Tab,
+            modifiers: KeyModifiers::NONE,
+        } => commands::jump_forward,
         ctrl!('o') => commands::jump_backward,
         // ctrl!('s') => commands::save_selection,
 

helix-view/src/view.rs

@@ -37,17 +37,24 @@ pub fn push(&mut self, jump: Jump) {
     pub fn forward(&mut self, count: usize) -> Option<&Jump> {
         if self.current + count < self.jumps.len() {
             self.current += count;
-            return self.jumps.get(self.current);
+            self.jumps.get(self.current)
+        } else {
+            None
         }
-        None
     }
 
-    pub fn backward(&mut self, count: usize) -> Option<&Jump> {
-        if self.current.checked_sub(count).is_some() {
-            self.current -= count;
-            return self.jumps.get(self.current);
+    // Taking view and doc to prevent unnecessary cloning when jump is not required.
+    pub fn backward(&mut self, view_id: ViewId, doc: &mut Document, count: usize) -> Option<&Jump> {
+        if let Some(current) = self.current.checked_sub(count) {
+            if self.current == self.jumps.len() {
+                let jump = (doc.id(), doc.selection(view_id).clone());
+                self.push(jump);
+            }
+            self.current = current;
+            self.jumps.get(self.current)
+        } else {
+            None
         }
-        None
     }
 }