From b9777487fb037830fdb97dcc9f8b4c684877b8dd Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas@devlieghere.com>
Date: Mon, 1 Dec 2025 10:30:31 -0800
Subject: [PATCH] [lldb] Fix a bug when disabling the statusline. (#169127)

Currently, disabling the statusline with `settings set show-statusline
false` leaves LLDB in a broken state. The same is true when trying to
toggle the setting again.

The issue was that setting the scroll window to 0 is apparently not
identical to setting it to the correct number of rows, even though some
documentation online incorrectly claims so.

Fixes #166608

(cherry picked from commit c103d61758e61a9fe4c1963b29d602ffe2c22427)
---
 lldb/source/Core/Statusline.cpp                          | 9 +++++----
 .../API/functionalities/statusline/TestStatusline.py     | 6 ++++--
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/lldb/source/Core/Statusline.cpp b/lldb/source/Core/Statusline.cpp
index bfbd190fba27c..922aada07e979 100644
--- a/lldb/source/Core/Statusline.cpp
+++ b/lldb/source/Core/Statusline.cpp
@@ -91,7 +91,7 @@ void Statusline::UpdateScrollWindow(ScrollWindowMode mode) {
   if (!stream_sp)
     return;
 
-  const unsigned reduced_scroll_window = m_terminal_height - 1;
+  const unsigned reduced_scroll_rows = m_terminal_height - 1;
   LockedStreamFile locked_stream = stream_sp->Lock();
 
   switch (mode) {
@@ -101,13 +101,14 @@ void Statusline::UpdateScrollWindow(ScrollWindowMode mode) {
     locked_stream.Printf(ANSI_UP_ROWS, 1);
     // Reduce the scroll window.
     locked_stream << ANSI_SAVE_CURSOR;
-    locked_stream.Printf(ANSI_SET_SCROLL_ROWS, reduced_scroll_window);
+    locked_stream.Printf(ANSI_SET_SCROLL_ROWS, reduced_scroll_rows);
     locked_stream << ANSI_RESTORE_CURSOR;
     break;
   case DisableStatusline:
     // Reset the scroll window.
     locked_stream << ANSI_SAVE_CURSOR;
-    locked_stream.Printf(ANSI_SET_SCROLL_ROWS, 0);
+    locked_stream.Printf(ANSI_SET_SCROLL_ROWS,
+                         static_cast<unsigned>(m_terminal_height));
     locked_stream << ANSI_RESTORE_CURSOR;
     // Clear the screen below to hide the old statusline.
     locked_stream << ANSI_CLEAR_BELOW;
@@ -116,7 +117,7 @@ void Statusline::UpdateScrollWindow(ScrollWindowMode mode) {
     // Clear the screen and update the scroll window.
     // FIXME: Find a better solution (#146919).
     locked_stream << ANSI_CLEAR_SCREEN;
-    locked_stream.Printf(ANSI_SET_SCROLL_ROWS, reduced_scroll_window);
+    locked_stream.Printf(ANSI_SET_SCROLL_ROWS, reduced_scroll_rows);
     break;
   }
 
diff --git a/lldb/test/API/functionalities/statusline/TestStatusline.py b/lldb/test/API/functionalities/statusline/TestStatusline.py
index 087e62b387d77..310cd8771f933 100644
--- a/lldb/test/API/functionalities/statusline/TestStatusline.py
+++ b/lldb/test/API/functionalities/statusline/TestStatusline.py
@@ -66,8 +66,10 @@ def test(self):
         )
         self.expect('set set separator "| "')
 
-        # Hide the statusline and check or the control character.
-        self.expect("set set show-statusline false", ["\x1b[1;0r"])
+        # Hide the statusline and check for the control character.
+        self.expect(
+            "set set show-statusline false", ["\x1b[1;{}r".format(self.TERMINAL_HEIGHT)]
+        )
 
     def test_no_color(self):
         """Basic test for the statusline with colors disabled."""