Update how tracking for macosx mouse enter/exit is handled

dopplershift · dopplershift · commit b6596412f664 · 2020-04-13T13:29:50.000-06:00
Instead of manually adding tracking rectangles and updating for resize
(older API), use a "newer" API (added OSX 10.5) for tracking areas. With
the right flags, these areas are automatically updated for resize.
diff --git a/src/_macosx.m b/src/_macosx.m
@@ -337,6 +337,13 @@ static CGFloat _get_device_scale(CGContextRef cr)
 
     NSRect rect = NSMakeRect(0.0, 0.0, width, height);
     self->view = [self->view initWithFrame: rect];
+    int opts = (NSTrackingMouseEnteredAndExited |
+                NSTrackingActiveInKeyWindow | NSTrackingInVisibleRect);
+    [self->view addTrackingArea: [
+        [NSTrackingArea alloc] initWithRect: rect
+                                    options: opts
+                                      owner: self->view
+                                   userInfo: nil]];
     [self->view setCanvas: (PyObject*)self];
     return 0;
 }
@@ -1565,7 +1572,6 @@ - (View*)initWithFrame:(NSRect)rect
     self = [super initWithFrame: rect];
     rubberband = NSZeroRect;
     inside = false;
-    tracking = 0;
     device_scale = 1;
     return self;
 }
@@ -1574,7 +1580,6 @@ - (void)dealloc
 {
     FigureCanvas* fc = (FigureCanvas*)canvas;
     if (fc) fc->view = NULL;
-    [self removeTrackingRect: tracking];
     [super dealloc];
 }
 
@@ -1713,11 +1718,6 @@ - (void)windowDidResize: (NSNotification*)notification
     else
         PyErr_Print();
     PyGILState_Release(gstate);
-    if (tracking) [self removeTrackingRect: tracking];
-    tracking = [self addTrackingRect: [self bounds]
-                               owner: self
-                            userData: nil
-                        assumeInside: NO];
     [self setNeedsDisplay: YES];
 }
 
