From fd00f3a70eb626242bb2fcc9bddf2c4d94580a9a Mon Sep 17 00:00:00 2001
From: Michael Davis <mcarsondavis@gmail.com>
Date: Wed, 23 Nov 2022 08:57:03 -0600
Subject: [PATCH] Don't apply transactions to Views in undo/redo

View::apply should only be called by EditorView after
42e37a571e75aaf4feb1717dfebe8cf215e535dd. This change removes the
duplicate calls within undo/redo which could cause a panic.
---
 helix-term/src/commands.rs       |  8 ++++----
 helix-term/src/commands/typed.rs |  4 ++--
 helix-view/src/document.rs       | 24 ++++++++++++------------
 3 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 8af5a7e3e400..4eb9742ff70e 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -3302,7 +3302,7 @@ fn undo(cx: &mut Context) {
     let count = cx.count();
     let (view, doc) = current!(cx.editor);
     for _ in 0..count {
-        if !doc.undo(view) {
+        if !doc.undo(view.id) {
             cx.editor.set_status("Already at oldest change");
             break;
         }
@@ -3313,7 +3313,7 @@ fn redo(cx: &mut Context) {
     let count = cx.count();
     let (view, doc) = current!(cx.editor);
     for _ in 0..count {
-        if !doc.redo(view) {
+        if !doc.redo(view.id) {
             cx.editor.set_status("Already at newest change");
             break;
         }
@@ -3325,7 +3325,7 @@ fn earlier(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     for _ in 0..count {
         // rather than doing in batch we do this so get error halfway
-        if !doc.earlier(view, UndoKind::Steps(1)) {
+        if !doc.earlier(view.id, UndoKind::Steps(1)) {
             cx.editor.set_status("Already at oldest change");
             break;
         }
@@ -3337,7 +3337,7 @@ fn later(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     for _ in 0..count {
         // rather than doing in batch we do this so get error halfway
-        if !doc.later(view, UndoKind::Steps(1)) {
+        if !doc.later(view.id, UndoKind::Steps(1)) {
             cx.editor.set_status("Already at newest change");
             break;
         }
diff --git a/helix-term/src/commands/typed.rs b/helix-term/src/commands/typed.rs
index b8f99ff369d2..475f14d1de3c 100644
--- a/helix-term/src/commands/typed.rs
+++ b/helix-term/src/commands/typed.rs
@@ -481,7 +481,7 @@ fn earlier(
     let uk = args.join(" ").parse::<UndoKind>().map_err(|s| anyhow!(s))?;
 
     let (view, doc) = current!(cx.editor);
-    let success = doc.earlier(view, uk);
+    let success = doc.earlier(view.id, uk);
     if !success {
         cx.editor.set_status("Already at oldest change");
     }
@@ -500,7 +500,7 @@ fn later(
 
     let uk = args.join(" ").parse::<UndoKind>().map_err(|s| anyhow!(s))?;
     let (view, doc) = current!(cx.editor);
-    let success = doc.later(view, uk);
+    let success = doc.later(view.id, uk);
     if !success {
         cx.editor.set_status("Already at newest change");
     }
diff --git a/helix-view/src/document.rs b/helix-view/src/document.rs
index 087085283391..0eb54f25fa6e 100644
--- a/helix-view/src/document.rs
+++ b/helix-view/src/document.rs
@@ -857,11 +857,11 @@ impl Document {
         success
     }
 
-    fn undo_redo_impl(&mut self, view: &mut View, undo: bool) -> bool {
+    fn undo_redo_impl(&mut self, view_id: ViewId, undo: bool) -> bool {
         let mut history = self.history.take();
         let txn = if undo { history.undo() } else { history.redo() };
         let success = if let Some(txn) = txn {
-            self.apply_impl(txn, view.id) && view.apply(txn, self)
+            self.apply_impl(txn, view_id)
         } else {
             false
         };
@@ -875,13 +875,13 @@ impl Document {
     }
 
     /// Undo the last modification to the [`Document`]. Returns whether the undo was successful.
-    pub fn undo(&mut self, view: &mut View) -> bool {
-        self.undo_redo_impl(view, true)
+    pub fn undo(&mut self, view_id: ViewId) -> bool {
+        self.undo_redo_impl(view_id, true)
     }
 
     /// Redo the last modification to the [`Document`]. Returns whether the redo was successful.
-    pub fn redo(&mut self, view: &mut View) -> bool {
-        self.undo_redo_impl(view, false)
+    pub fn redo(&mut self, view_id: ViewId) -> bool {
+        self.undo_redo_impl(view_id, false)
     }
 
     pub fn savepoint(&mut self) {
@@ -894,7 +894,7 @@ impl Document {
         }
     }
 
-    fn earlier_later_impl(&mut self, view: &mut View, uk: UndoKind, earlier: bool) -> bool {
+    fn earlier_later_impl(&mut self, view_id: ViewId, uk: UndoKind, earlier: bool) -> bool {
         let txns = if earlier {
             self.history.get_mut().earlier(uk)
         } else {
@@ -902,7 +902,7 @@ impl Document {
         };
         let mut success = false;
         for txn in txns {
-            if self.apply_impl(&txn, view.id) && view.apply(&txn, self) {
+            if self.apply_impl(&txn, view_id) {
                 success = true;
             }
         }
@@ -914,13 +914,13 @@ impl Document {
     }
 
     /// Undo modifications to the [`Document`] according to `uk`.
-    pub fn earlier(&mut self, view: &mut View, uk: UndoKind) -> bool {
-        self.earlier_later_impl(view, uk, true)
+    pub fn earlier(&mut self, view_id: ViewId, uk: UndoKind) -> bool {
+        self.earlier_later_impl(view_id, uk, true)
     }
 
     /// Redo modifications to the [`Document`] according to `uk`.
-    pub fn later(&mut self, view: &mut View, uk: UndoKind) -> bool {
-        self.earlier_later_impl(view, uk, false)
+    pub fn later(&mut self, view_id: ViewId, uk: UndoKind) -> bool {
+        self.earlier_later_impl(view_id, uk, false)
     }
 
     /// Commit pending changes to history