winecfg: Add option to enable/disable GTK3 theming.

programs/winecfg/resource.h

@@ -217,6 +217,7 @@
 #define IDC_ENABLE_VAAPI                9002
 #define IDC_ENABLE_EAX                  9003
 #define IDC_ENABLE_HIDEWINE             9004
+#define IDC_ENABLE_GTK3                 9005
 
 /* About tab */
 #define IDC_ABT_OWNER                8432

programs/winecfg/staging.c

@@ -90,6 +90,21 @@ static void hidewine_set(BOOL status)
     set_reg_key(config_key, keypath(L""), L"HideWineExports", status ? L"Y" : L"N");
 }
 
+/*
+ * GTK3
+ */
+static BOOL gtk3_get(void)
+{
+    BOOL ret;
+    WCHAR *value = get_reg_key(config_key, keypath(L""), L"ThemeEngine", NULL);
+    ret = (value && !wcsicmp(value, L"GTK"));
+    HeapFree(GetProcessHeap(), 0, value);
+    return ret;
+}
+static void gtk3_set(BOOL status)
+{
+    set_reg_key(config_key, keypath(L""), L"ThemeEngine", status ? L"GTK" : NULL);
+}
 
 static void load_staging_settings(HWND dialog)
 {
@@ -97,6 +112,7 @@ static void load_staging_settings(HWND dialog)
     CheckDlgButton(dialog, IDC_ENABLE_VAAPI, vaapi_get() ? BST_CHECKED : BST_UNCHECKED);
     CheckDlgButton(dialog, IDC_ENABLE_EAX, eax_get() ? BST_CHECKED : BST_UNCHECKED);
     CheckDlgButton(dialog, IDC_ENABLE_HIDEWINE, hidewine_get() ? BST_CHECKED : BST_UNCHECKED);
+    CheckDlgButton(dialog, IDC_ENABLE_GTK3, gtk3_get() ? BST_CHECKED : BST_UNCHECKED);
 }
 
 INT_PTR CALLBACK StagingDlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
@@ -138,6 +154,10 @@ INT_PTR CALLBACK StagingDlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lPar
             hidewine_set(IsDlgButtonChecked(hDlg, IDC_ENABLE_HIDEWINE) == BST_CHECKED);
             SendMessageW(GetParent(hDlg), PSM_CHANGED, 0, 0);
             return TRUE;
+        case IDC_ENABLE_GTK3:
+            gtk3_set(IsDlgButtonChecked(hDlg, IDC_ENABLE_GTK3) == BST_CHECKED);
+            SendMessageW(GetParent(hDlg), PSM_CHANGED, 0, 0);
+            return TRUE;
         }
         break;
     }

programs/winecfg/winecfg.rc

@@ -321,6 +321,7 @@ BEGIN
     CONTROL     "Enable &VAAPI as backend for DXVA2 GPU decoding",IDC_ENABLE_VAAPI,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,55,230,8
     CONTROL     "Enable Environmental Audio E&xtensions (EAX)",IDC_ENABLE_EAX,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,70,230,8
     CONTROL     "&Hide Wine version from applications",IDC_ENABLE_HIDEWINE,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,85,230,8
+    CONTROL     "Enable &GTK3 Theming",IDC_ENABLE_GTK3,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,100,230,8
 END
 
 LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL