Mac: Enable close button when running "Show Graphics" from BOINC Manager under MacOS 11 Big Sur

api/graphics2_unix.cpp

@@ -137,9 +137,13 @@ static void maybe_render() {
                     ypos = new_ypos;
                     width = new_width;
                     height = new_height;
+
                 } else {
                     if (size_changed && (++size_changed > 10)) {
                         size_changed = 0;
+#ifdef __APPLE__
+                        ClearDocumentEditedDot();
+#endif
                         FILE *f = boinc_fopen("gfx_info", "w");
                         if (f) {
                             // ToDo: change this to XML

api/macglutfix.m

@@ -59,16 +59,23 @@ int compareOSVersionTo(int toMajor, int toMinor);
 // Delay when switching to screensaver mode to reduce annoying flashes
 #define SAVERDELAY 30
 
+// NSClosableWindowMask is deprecated in OS 10.12 and is replaced by
+// NSWindowStyleMaskClosable, which is not defined before OS 10.12
+#ifndef NSWindowStyleMaskClosable
+#define NSWindowStyleMaskClosable NSClosableWindowMask
+#endif
+
+static NSWindow* myWindow = nil;
+
 void MacGLUTFix(bool isScreenSaver) {
     static int count = 0;
     static NSMenu * emptyMenu;
     NSOpenGLContext * myContext = nil;
     NSView *myView = nil;
-    NSWindow* myWindow = nil;
     static int requestedWidth, requestedHeight;
 
-    if (count > 1) return;   // Do this only twice
-    count++;
+    if (count == 2) ClearDocumentEditedDot();
+    if (count++ > 2) return;   // Do the code below only twice
     
     if (! boinc_is_standalone()) {
         if (emptyMenu == nil) {
@@ -109,9 +116,7 @@ void MacGLUTFix(bool isScreenSaver) {
             glutReshapeWindow(requestedWidth, requestedHeight);
         }
         
-        NSButton *closeButton = [myWindow standardWindowButton:NSWindowCloseButton ];
-        [closeButton setEnabled:YES];
-        [myWindow setDocumentEdited: NO];
+        [myWindow setStyleMask:[myWindow styleMask] | NSWindowStyleMaskClosable];
         
         return;
     }
@@ -131,6 +136,12 @@ void MacGLUTFix(bool isScreenSaver) {
     }
 }
 
+void ClearDocumentEditedDot(void) {
+    if (myWindow) {
+        [myWindow setDocumentEdited: NO];
+    }
+}
+
 #if 0
 // NOT USED: See comments in animateOneFrame in Mac_Saver_ModuleView.m
 // <https://developer.apple.com/library/content/technotes/tn2169>

api/x_opengl.h

@@ -26,6 +26,7 @@ extern int xwin_glut_is_initialized();
 
 #ifdef __APPLE__
 extern void MacGLUTFix(bool isScreenSaver);
+extern void ClearDocumentEditedDot(void);
 extern void MacPassOffscreenBufferToScreenSaver(void);
 extern void BringAppToFront(void);
 extern void HideThisApp(void);