This may be obvious, but for people like me yesterday to whom it isn't: I wrote a simple client to test my understanding of window gravity and spent far too long looking for a bug that was not there.
Create within one window a smaller window at each corner, centered on each edge, and in the center, with each window's window gravity set to keep it in the corner, centered on the edge, or in the center. Resize the parent window multiple times. Perhaps the easiest way is with an opaquely resizing window manager. After some number of resizings, it will be apparent that the formerly centered windows are no longer centered. My naïve expectation was that they would be, and I assumed I had done something wrong or that the window managers I tried were somehow broken. Eventually I looked for bug reports or mailing list discussions of the matter, but never found this explanation: Odd numbers are not divisible by 2. In the course of resizing the parent window, the centered windows are shifted to decreasing coordinates because of rounding. Those who better remember the documented meaning of window gravity may laugh at the suggestion that it would have kept an initially centered window centered. Anyone who wishes to rely on a centered gravity should ensure even window dimensions and resize increments. I assume this serves as a caveat and not a description of a bug. Cheers, Greg _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: arch...@mail-archive.com
