[PATCH 1/3] win32u: Use window monitor DPI in get_windows_offset when dpi is 0.

[Rémi Bernon]

From: Rémi Bernon

The server path advertises doing a similar thing.
---
 dlls/win32u/window.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index 8ca49afcd87..f49a8ecb27b 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -2784,6 +2784,7 @@ static BOOL get_windows_offset( HWND hwnd_from, HWND hwnd_to, UINT dpi, BOOL *mi
         if (win == WND_OTHER_PROCESS) goto other_process;
         if (win != WND_DESKTOP)
         {
+            UINT dpi_from = dpi ? dpi : get_win_monitor_dpi( hwnd_from );
             if (win->dwExStyle & WS_EX_LAYOUTRTL)
             {
                 mirror_from = TRUE;
@@ -2805,7 +2806,7 @@ static BOOL get_windows_offset( HWND hwnd_from, HWND hwnd_to, UINT dpi, BOOL *mi
                 }
             }
             if (win && win != WND_DESKTOP) release_win_ptr( win );
-            offset = map_dpi_point( offset, get_dpi_for_window( hwnd_from ), dpi );
+            offset = map_dpi_point( offset, get_dpi_for_window( hwnd_from ), dpi_from );
         }
     }

@@ -2820,6 +2821,7 @@ static BOOL get_windows_offset( HWND hwnd_from, HWND hwnd_to, UINT dpi, BOOL *mi
         if (win == WND_OTHER_PROCESS) goto other_process;
         if (win != WND_DESKTOP)
         {
+            UINT dpi_to = dpi ? dpi : get_win_monitor_dpi( hwnd_to );
             POINT pt = { 0, 0 };
             if (win->dwExStyle & WS_EX_LAYOUTRTL)
             {
@@ -2842,7 +2844,7 @@ static BOOL get_windows_offset( HWND hwnd_from, HWND hwnd_to, UINT dpi, BOOL *mi
                 }
             }
             if (win && win != WND_DESKTOP) release_win_ptr( win );
-            pt = map_dpi_point( pt, get_dpi_for_window( hwnd_to ), dpi );
+            pt = map_dpi_point( pt, get_dpi_for_window( hwnd_to ), dpi_to );
             offset.x -= pt.x;
             offset.y -= pt.y;
         }