This is the first time I’ve ever encountered this behavior, and am wondering if anyone has seen it. I’m working on a canvas-based control which displays a combination of paint-event-created objects (e.g., a background created with a call to fillRect, and an image on top of that), along with a group-2D drawn last in the paint event which the user can drag around the canvas. This Group2D object consists of a rectShape and eight ovalShapes which act as “handles” that the user can also drag to change the size of the rectangle.
It works very well at this point, EXCEPT that while it’s totally flicker-free during the dragging operations in the Windows build, it often flickers, sometimes horribly, in the Mac build.
In all my years of using RB, RS, and Xojo, this is the first time that I’ve had flickering problems in a Mac build (and almost the first time I’ve had none in a Windows build). I’ve tried it with Xojo 2014r2.1 and 2015r1 with the same results on Mac OS X 10.10.2 and Windows 7 running in a Parallels VM.
Could this be a Yosemite issue? I don’t have a Mavericks or earlier machine handy to test on…