From 67537bfc80e0efefd555bf1b5cda4eac1a01fbdb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20C=C3=A9sar=20Neves=20Enumo?=
 <paker_wreah@hotmail.com>
Date: Wed, 5 May 2021 12:21:45 -0300
Subject: [PATCH] LibGUI: Clear undo stack when opening a new document

---
 Userland/Libraries/LibGUI/TextDocument.cpp | 1 +
 Userland/Libraries/LibGUI/UndoStack.cpp    | 6 ++++++
 Userland/Libraries/LibGUI/UndoStack.h      | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/Userland/Libraries/LibGUI/TextDocument.cpp b/Userland/Libraries/LibGUI/TextDocument.cpp
index 6799e5c90d..27042d1696 100644
--- a/Userland/Libraries/LibGUI/TextDocument.cpp
+++ b/Userland/Libraries/LibGUI/TextDocument.cpp
@@ -41,6 +41,7 @@ TextDocument::~TextDocument()
 bool TextDocument::set_text(const StringView& text)
 {
     m_client_notifications_enabled = false;
+    m_undo_stack.clear();
     m_spans.clear();
     remove_all_lines();
 
diff --git a/Userland/Libraries/LibGUI/UndoStack.cpp b/Userland/Libraries/LibGUI/UndoStack.cpp
index 7267c83bf4..7f32d3e4fb 100644
--- a/Userland/Libraries/LibGUI/UndoStack.cpp
+++ b/Userland/Libraries/LibGUI/UndoStack.cpp
@@ -80,4 +80,10 @@ void UndoStack::finalize_current_combo()
     m_stack.prepend(move(undo_commands_container));
 }
 
+void UndoStack::clear()
+{
+    m_stack.clear();
+    m_stack_index = 0;
+}
+
 }
diff --git a/Userland/Libraries/LibGUI/UndoStack.h b/Userland/Libraries/LibGUI/UndoStack.h
index 0921d835a5..f854171c83 100644
--- a/Userland/Libraries/LibGUI/UndoStack.h
+++ b/Userland/Libraries/LibGUI/UndoStack.h
@@ -26,6 +26,8 @@ public:
 
     void finalize_current_combo();
 
+    void clear();
+
 private:
     struct UndoCommandsContainer {
         NonnullOwnPtrVector<Command> m_undo_vector;