user32: Prevent resize of minimized windows from SetWindowPos.

dlls/user32/tests/win.c

@@ -4923,7 +4923,7 @@ static void test_ShowWindow(void)
                        SWP_NOMOVE | SWP_NOACTIVATE | SWP_NOZORDER);
     ok(ret, "not expected ret: %lu\n", ret);
     GetWindowRect(hwnd, &rc);
-    todo_wine ok(EqualRect(&rc, &rcMinimized), "rects should match\n");
+    ok(EqualRect(&rc, &rcMinimized), "rects should match\n");
 
     ShowWindow(hwnd, SW_RESTORE);
     ok(ret, "not expected ret: %lu\n", ret);

dlls/user32/winpos.c

@@ -1519,8 +1519,16 @@ static BOOL SWP_DoWinPosChanging( WINDOWPOS* pWinpos, RECT* pNewWindowRect, RECT
 
     if (!(pWinpos->flags & SWP_NOSIZE))
     {
-        pNewWindowRect->right  = pNewWindowRect->left + pWinpos->cx;
-        pNewWindowRect->bottom = pNewWindowRect->top + pWinpos->cy;
+        if (wndPtr->dwStyle & WS_MINIMIZE)
+        {
+            pNewWindowRect->right  = pNewWindowRect->left + GetSystemMetrics(SM_CXICON);
+            pNewWindowRect->bottom = pNewWindowRect->top + GetSystemMetrics(SM_CYICON);
+        }
+        else
+        {
+            pNewWindowRect->right  = pNewWindowRect->left + pWinpos->cx;
+            pNewWindowRect->bottom = pNewWindowRect->top + pWinpos->cy;
+        }
     }
     if (!(pWinpos->flags & SWP_NOMOVE))
     {