Open Radar

 
Summary:

A window's frame can only be set with full points. Setting a half-point value for the window's origin causes the next lowest integral value to be used. Setting a half-point value for the size causes the next highest integral value to be used.

Steps to Reproduce:

1) Create an NSWindow.
2) Call -setFrame:display: using an NSRect with non-integral values.

(See the attached sample application)

Expected Results:

The window's position should be set to non-integral values.

In the sample application running on a Retina display, the window's x origin should move one pixel and it's width should grow by one pixel.

Actual Results:

The window's position is set to integral values.

The sample application's window origin does not change and it's size grows by two pixels.

Regression:

Prior to a Retina display, there was no need to align windows with non-integral values.

Notes:

Setting the position to non-integral values is very useful if an application is using a secondary NSWindow as a callout/overlay for another NSWindow that contains high resolution imagery. The secondary window can't be aligned perfectly.