PUGL: fix to get events from the beginning in Bitwig on macOS

Signed-off-by: Stefan Westerfeld <[email protected]>

glui/pugl/pugl_osx.m

@@ -172,6 +172,7 @@ - (id) initWithFrame:(NSRect)frame
 
 - (void) reshape
 {
+	[super reshape];
 	[[self openGLContext] update];
 
 	if (!puglview) {
@@ -227,6 +228,11 @@ - (void) drawRect:(NSRect)rect
 #endif
 }
 
+- (BOOL) acceptsFirstMouse:(NSEvent *)event
+{
+	return YES;
+}
+
 - (BOOL) acceptsFirstResponder
 {
 	return YES;
@@ -599,6 +605,8 @@ - (void) flagsChanged:(NSEvent*)event
 		[pview addSubview:impl->glview];
 		// required to get mouse move events in Ableton Live (and possibly other hosts)
 		[[pview window] setAcceptsMouseMovedEvents: YES];
+		// focus our view (required to get events from the beginning in Bitwig)
+		[[pview window] makeFirstResponder:impl->glview];
 		[impl->glview setHidden:NO];
 	} else {
 		NSString* titleString = [[NSString alloc]