From 9818c3e0077dcf262b121370ef191b56c224d51a Mon Sep 17 00:00:00 2001
From: Andrey Kleshchev <117672381+akleshchev@users.noreply.github.com>
Date: Fri, 28 Aug 2026 20:59:44 +0300
Subject: p#700 Fix issue with tittle bar on Windows

---
 indra/llwindow/llwindow.h        | 5 +++++
 indra/llwindow/llwindowmacosx.h  | 4 ++++
 indra/llwindow/llwindowwin32.h   | 4 ++++
 indra/newview/llviewerwindow.cpp | 4 ++--
 4 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/indra/llwindow/llwindow.h b/indra/llwindow/llwindow.h
index 327323b018..3f06bf1a50 100644
--- a/indra/llwindow/llwindow.h
+++ b/indra/llwindow/llwindow.h
@@ -78,7 +78,12 @@ public:
     virtual void restore() = 0;
     bool getFullscreen()    { return mFullscreen; };
     virtual bool getPosition(LLCoordScreen *position) = 0;
+
+    // Returns the platform-defined window size in physical (backing) pixels.
+    // On macOS: backing content view size (excludes title bar).
+    // On Windows: outer window frame size (includes title bar and borders).
     virtual bool getSize(LLCoordScreen *size) = 0;
+
     virtual bool getSize(LLCoordWindow *size) = 0;
     virtual bool setPosition(LLCoordScreen position) = 0;
     bool setSize(LLCoordScreen size);
diff --git a/indra/llwindow/llwindowmacosx.h b/indra/llwindow/llwindowmacosx.h
index cc6490bb62..a9475c84cc 100644
--- a/indra/llwindow/llwindowmacosx.h
+++ b/indra/llwindow/llwindowmacosx.h
@@ -50,7 +50,11 @@ public:
     void restore() override;
     bool getFullscreen();
     bool getPosition(LLCoordScreen *position) override;
+
+    // Content view size in backing pixels (excludes title bar).
+    // Note: on Windows, getSize(LLCoordScreen) returns the outer window frame size (includes title bar and borders).
     bool getSize(LLCoordScreen *size) override;
+
     bool getSize(LLCoordWindow *size) override;
     bool setPosition(LLCoordScreen position) override;
     bool setSizeImpl(LLCoordScreen size) override;
diff --git a/indra/llwindow/llwindowwin32.h b/indra/llwindow/llwindowwin32.h
index 0b104c6da8..9ccd0a3ee2 100644
--- a/indra/llwindow/llwindowwin32.h
+++ b/indra/llwindow/llwindowwin32.h
@@ -62,7 +62,11 @@ public:
     void restore() override;
     bool getFullscreen();
     bool getPosition(LLCoordScreen *position) override;
+
+    // Outer window frame size in pixels (includes title bar and borders).
+    // Note OS Specific behavior: On macOS excludes title bar.
     bool getSize(LLCoordScreen *size) override;
+
     bool getSize(LLCoordWindow *size) override;
     bool setPosition(LLCoordScreen position) override;
     bool setSizeImpl(LLCoordScreen size) override;
diff --git a/indra/newview/llviewerwindow.cpp b/indra/newview/llviewerwindow.cpp
index e44dbd8f0b..637c03cdaa 100644
--- a/indra/newview/llviewerwindow.cpp
+++ b/indra/newview/llviewerwindow.cpp
@@ -6094,10 +6094,10 @@ void LLViewerWindow::checkSettings()
         mStatesDirty = false;
     }
 
-    // We want to update the resolution AFTER the states getting refreshed not before.
     if (mResDirty)
     {
-        LLCoordScreen window_size;
+        // Deferred resolution update after states have been refreshed.
+        LLCoordWindow window_size;
         if (mWindow->getSize(&window_size))
         {
             reshape(window_size.mX, window_size.mY);
-- 
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