[PATCH v2 2/2] win32u: Only inflate dirty rect when dpi conversion is performed in expose_window_surface().

[Paul Gofman]

From: Paul Gofman

---
 dlls/win32u/window.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index afe68d08d53..7b761257306 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -2207,6 +2207,7 @@ static BOOL expose_window_surface( HWND hwnd, UINT flags, const RECT *rect, UINT
     struct window_surface *surface;
     struct window_rects rects;
     RECT window_rect;
+    UINT win_dpi;
     WND *win;

if (!(win = get_win_ptr( hwnd )) || win == WND_DESKTOP || win == WND_OTHER_PROCESS) return FALSE;
@@ -2216,8 +2217,12 @@ static BOOL expose_window_surface( HWND hwnd, UINT flags, const RECT *rect, UINT

if (rect)
     {
-        window_rect = map_dpi_rect( *rect, dpi, get_dpi_for_window( hwnd ) );
-        InflateRect( &window_rect, 1, 1 ); /* compensate rounding errors */
+        if ((win_dpi = get_dpi_for_window( hwnd )) != dpi)
+        {
+            window_rect = map_dpi_rect( *rect, dpi, win_dpi );
+            InflateRect( &window_rect, 1, 1 ); /* compensate rounding errors */
+        }
+        else window_rect = *rect;
     }

if (!surface || surface == &dummy_surface)