(nut-tree/nut.js#505) Adapt changes from bolt to libnut screengrab implementation

Author: s1hofmann

src/macos/highlightwindow.m

@@ -2,26 +2,30 @@
 #import <Cocoa/Cocoa.h>
 
 void showHighlightWindow(int32_t x, int32_t y, int32_t width, int32_t height, long duration, float opacity) {
-    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
+    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
     [NSApplication sharedApplication];
-
+    bool appIsRunning = [NSApp isRunning];
     NSRect mainScreenFrameRect = [[NSScreen mainScreen] frame];
     CGFloat screenHeight = mainScreenFrameRect.size.height;
     NSRect frame = NSMakeRect(x, screenHeight - y - height, width, height);
     NSUInteger styleMask = NSWindowStyleMaskBorderless;
-    NSWindow * window =  [[[NSWindow alloc] initWithContentRect:frame styleMask:styleMask backing:NSBackingStoreBuffered defer:NO] autorelease];
+    NSWindow *window = [[[NSWindow alloc] initWithContentRect:frame styleMask:styleMask backing:NSBackingStoreBuffered defer:NO] autorelease];
     [window setBackgroundColor:[NSColor redColor]];
     [window setAlphaValue:opacity];
     [window orderFrontRegardless];
 
-    [NSTimer scheduledTimerWithTimeInterval: duration / 1000.0
-                repeats: NO
-                block: ^(NSTimer * timer){
-                [NSApp stop:0];
-                NSRect f = [window frame];
-                f.size = CGSizeMake(0, 0);
-                [window setFrame: f display: YES animate: NO];
-            }];
-    [NSApp run];
+    [NSTimer scheduledTimerWithTimeInterval:duration / 1000.0
+                                    repeats:NO
+                                      block:^(NSTimer *timer) {
+                                          if (!appIsRunning) {
+                                              [NSApp stop:nil];
+                                          }
+                                          NSRect f = [window frame];
+                                          f.size = CGSizeMake(0, 0);
+                                          [window setFrame:f display:YES animate:NO];
+                                      }];
+    if (!appIsRunning) {
+        [NSApp run];
+    }
     [pool release];
-}
+}