Fix comments to be more accurate

api/macglutfix.m

@@ -292,14 +292,14 @@ - (void)sendIOSurfaceMachPortToClients:(uint32_t)index withMachPort:(mach_port_t
 @end
 
 
-// Under OS 10.15 Catalina, OpenGL apps apparently use window dimensions 
-// based on the number of backing store pixels. That is, they double the 
-// window dimensions for Retina displays (which have two pixels per point.) 
-// But OpenGL apps running under earlier versions of OS X don't. As a 
-// result, Catalina displays BOINC graphics at half width and height 
-// unless we compensate in our code.
-// This code is part of my attempt to ensure that BOINC graphics apps are 
-// displayed properly on different versions of OS X. See also 
+// OpenGL apps built under Xcode 11 apparently use window dimensions based 
+// on the number of backing store pixels. That is, they double the window 
+// dimensiona for Retina displays (which have two pixels per point.) But 
+// OpenGL apps built under earlier versions of Xcode don't.
+// Catalina assumes OpenGL apps work as built under Xcode 11, so it displays
+// older builds at half width and height, unless we compensate in our code.
+// This code is part of my attempt to ensure that BOINC graphics apps built on 
+// all versions of Xcode work proprly on different versions of OS X. See also 
 // [BOINC_Saver_ModuleView initWithFrame:] in clientscr/Mac_Saver_ModuleCiew.m
 //
 void MacPassOffscreenBufferToScreenSaver() {

clientscr/Mac_Saver_ModuleView.m

@@ -218,14 +218,14 @@ - (id)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview {
         myIsPreview = isPreview;
     }
 
-    // Under OS 10.15 Catalina, OpenGL apps apparently use window dimensions 
-    // based on the number of backing store pixels. That is, they double the 
-    // window dimensions for Retina displays (which have two pixels per point.) 
-    // But OpenGL apps running under earlier versions of OS X don't. As a 
-    // result, Catalina displays BOINC graphics at half width and height, 
-    // unless we compensate in our code.
-    // This code is part of my attempt to ensure that BOINC graphics apps are 
-    // displayed properly on different versions of OS X. See also 
+    // OpenGL apps built under Xcode 11 apparently use window dimensions based 
+    // on the number of backing store pixels. That is, they double the window 
+    // dimensiona for Retina displays (which have two pixels per point.) But 
+    // OpenGL apps built under earlier versions of Xcode don't.
+    // Catalina assumes OpenGL apps work as built under Xcode 11, so it displays
+    // older builds at half width and height, unless we compensate in our code.
+    // This code is part of my attempt to ensure that BOINC graphics apps built on 
+    // all versions of Xcode work proprly on different versions of OS X. See also 
     // MacPassOffscreenBufferToScreenSaver() in lib/magglutfix.m for more info.
     //
     if (gIsCatalina) {