user32: Load uxtheme when theming is active.

dlls/comctl32/commctrl.c

@@ -208,9 +208,6 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
             TRACKBAR_Register ();
             TREEVIEW_Register ();
             UPDOWN_Register ();
-
-            /* Call IsThemeActive() so that delay-loaded uxtheme.dll is loaded for hooking user32 */
-            IsThemeActive();
             break;
 
 	case DLL_PROCESS_DETACH:

dlls/user32/class.c

@@ -539,6 +539,19 @@ static void register_builtin( const struct builtin_class_descr *descr )
     release_class_ptr( classPtr );
 }
 
+static void load_uxtheme(void)
+{
+    BOOL (WINAPI * pIsThemeActive)(void);
+    HMODULE uxtheme;
+
+    uxtheme = LoadLibraryA("uxtheme.dll");
+    if (uxtheme)
+    {
+        pIsThemeActive = (void *)GetProcAddress(uxtheme, "IsThemeActive");
+        if (!pIsThemeActive || !pIsThemeActive())
+            FreeLibrary(uxtheme);
+    }
+}
 
 /***********************************************************************
  *           register_builtins
@@ -557,6 +570,9 @@ static BOOL WINAPI register_builtins( INIT_ONCE *once, void *param, void **conte
     register_builtin( &SCROLL_builtin_class );
     register_builtin( &STATIC_builtin_class );
     register_builtin( &IME_builtin_class );
+
+    /* Load uxtheme.dll so that standard scrollbars and dialogs are hooked for theming support */
+    load_uxtheme();
     return TRUE;
 }
 

dlls/user32/tests/class.c

@@ -1511,6 +1511,7 @@ static void test_uxtheme(void)
     dll_loaded = !!GetModuleHandleA("comctl32.dll");
     ok(!dll_loaded, "Expected comctl32.dll not loaded.\n");
     dll_loaded = !!GetModuleHandleA("uxtheme.dll");
+    todo_wine_if(dll_loaded)
     ok(!dll_loaded, "Expected uxtheme.dll not loaded.\n");
 
     /* Creating a window triggers uxtheme load when theming is active */
@@ -1531,7 +1532,6 @@ static void test_uxtheme(void)
     is_theme_active = pIsThemeActive();
     FreeLibrary(uxtheme);
 
-    todo_wine_if(is_theme_active)
     ok(dll_loaded == is_theme_active, "Expected uxtheme %s when theming is %s.\n",
        is_theme_active ? "loaded" : "not loaded", is_theme_active ? "active" : "inactive");