[gtk/wip/otte/gleanup] GDK-Win32: init_gl(): Default to WGL for now

[Chun-wei Fan <fanchunwei src gnome org>]

commit f11307299cf7c1c120b94bf0b49eddf11672cefe
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Jul 19 10:48:03 2021 +0800

    GDK-Win32: init_gl(): Default to WGL for now
    
    Since the shaders need to be updated for using with GLES (libANGLE at
    least), default to WGL for now.  Unfortunately it is not that common for
    Windows to have GLES support, in which the easiest way to obtain such
    support is via Google's libANGLE.

 gdk/win32/gdkdisplay-win32.c | 25 +++++++------------------
 1 file changed, 7 insertions(+), 18 deletions(-)
---
diff --git a/gdk/win32/gdkdisplay-win32.c b/gdk/win32/gdkdisplay-win32.c
index c3d001baca..3a69ee448a 100644
--- a/gdk/win32/gdkdisplay-win32.c
+++ b/gdk/win32/gdkdisplay-win32.c
@@ -1172,32 +1172,21 @@ gdk_win32_display_init_gl_backend (GdkDisplay  *display,
   if (GDK_DISPLAY_DEBUG_CHECK (display, GL_WGL))
     return gdk_win32_display_init_wgl (display, error);
 
-  /* No env vars set, do the regular GL initialization.
-   * 
-   * We try EGL first if supported, but are very picky about what we accept.
-   * If that fails, we try to go with WGL instead.
-   * And if that also fails, we try EGL again, but this time accept anything.
-   *
-   * The idea here is that EGL is the preferred method going forward, but WGL is
-   * the tried and tested method that we know works. So if we detect issues with
-   * EGL, we want to avoid using it in favor of WGL.
+  /* No env vars set, do the regular GL initialization, first WGL and then EGL,
+   * as WGL is the more tried-and-tested configuration.
    */
 
-#ifdef GDK_WIN32_ENABLE_EGL
-  if (gdk_win32_display_init_egl (display, error))
-    return TRUE;
-#endif
-  g_clear_error (error);
-
   if (gdk_win32_display_init_wgl (display, error))
     return TRUE;
   g_clear_error (error);
 
 #ifdef GDK_WIN32_ENABLE_EGL
-  return gdk_win32_display_init_egl (display, error);
-#else
-  return FALSE;
+  if (gdk_win32_display_init_egl (display, error))
+    return TRUE;
 #endif
+  g_clear_error (error);
+
+  return gdk_win32_display_init_wgl (display, error);
 }
 
 static GdkGLContext *