Faker: Ignore Num Lock state w/ popup key sequence

Referring to 4a75e02 (2.0 beta1) and
7dbdbdc (2.1), the VirtualGL Faker's
event handler historically matched both Mod1Mask and Mod2Mask in the
modifier state to an Alt key sequence in VGL_GUI.  In the dawn of time
(AKA 2000 and late), that was correct, because Mod2Mask was used for the
right Alt key.  In 2025, however, Mod2Mask is used for Num Lock, and
either Mod1Mask (Linux, FreeBSD) or Mod5Mask (Solaris 11) is used for
the right Alt key.  Thus, the modifier state will always contain
Mod2Mask if Num Lock is on, so the event handler's previous logic never
matched fconfig.guimod in that case.  Since we don't support Solaris
anymore and fconfig.guimod will only ever contain ShiftMask,
ControlMask, or Mod1Mask, the correct modern solution is to mask off all
other bits in the modifier state before comparing it to fconfig.guimod.

Author: dcommander

ChangeLog.md

@@ -17,6 +17,9 @@ the X keyboard extension was enabled on the 2D X server.
 other elements of the Firefox browser window to disappear when the window was
 resized.
 
+5. Fixed an issue whereby the VirtualGL Configuration dialog did not pop up if
+the Num Lock key was on.
+
 
 2.6.6 ESR
 =========

server/faker-x11.cpp

@@ -1,6 +1,6 @@
 // Copyright (C)2004 Landmark Graphics Corporation
 // Copyright (C)2005, 2006 Sun Microsystems, Inc.
-// Copyright (C)2009, 2011-2016, 2018-2023 D. R. Commander
+// Copyright (C)2009, 2011-2016, 2018-2023, 2025 D. R. Commander
 //
 // This library is free software and may be redistributed and/or modified under
 // the terms of the wxWindows Library License, Version 3.1 or (at your option)
@@ -674,16 +674,11 @@ static void handleEvent(Display *dpy, XEvent *xe)
 	}
 	else if(xe && xe->type == KeyPress)
 	{
-		unsigned int state2, state = (xe->xkey.state & (~(LockMask))) & 0xFF;
-		state2 = fconfig.guimod;
-		if(state2 & Mod1Mask)
-		{
-			state2 &= (~(Mod1Mask));  state2 |= Mod2Mask;
-		}
+		unsigned int state =
+			xe->xkey.state & (ShiftMask | ControlMask | Mod1Mask);
 		if(fconfig.gui
 			&& KeycodeToKeysym(dpy, xe->xkey.keycode, 0) == fconfig.guikey
-			&& (state == fconfig.guimod || state == state2)
-			&& fconfig_getshmid() != -1)
+			&& state == fconfig.guimod && fconfig_getshmid() != -1)
 			VGLPOPUP(dpy, fconfig_getshmid());
 	}
 	else if(xe && xe->type == ClientMessage)