Description of problem: When a window with widgets containing borders is dragged off the screen and back on (under a window manager that actively updates the window content as the window is dragged), the borders are drawn incorrectly (they appear to be one frame behind). Version-Release number of selected component (if applicable): X.Org X Server 1.4.99.901 (1.5.0 RC 1) Release Date: 5 September 2007 X Protocol Version 11, Revision 0 How reproducible: Very easy to reproduce; one just needs Fedora 9 with an up-to-date (as of 2008-05-22) Xorg, a window manager that draws the whole window being dragged instead of just an outline (e.g. metacity or kwin), and a program that draws borders (such as xterm or the sample program attached). I have personally reproduced this on a fully X-upgraded Fedora 9 with a fully upgraded xterm on my PC with a Radeon 9250. I also reproduced it on an iBook G3 under the r128 (Rage 128) driver. The problem appears under both metacity and kwin. I also asked someone on IRC to try my sample program with borders, and he saw the problem, too. This problem does not appear on Kubuntu Hardy (which I guess has an older version of Xorg). Steps to Reproduce: 1. Download the attached C program and build with the following command: gcc -Os -Wall -W -lX11 xbordertest.c -o xbordertest 2. Run the program, and drag the window to the edge, hiding the red and blue squares. Then, drag the window back on screen. You should see the black frames (borders) around both rectangles getting smeared. If not, try another edge :) Alternatively, if you're leery of running my code, don't know how to audit it, or simply don't feel like compiling and running it, you can observe this problem under xterm with the same procedure. :) Actual results: Child borders are redrawn off-step (and thus smeared) when the window is dragged off the screen and back on. Expected results: Child borders should be drawn correctly all the time like in earlier versions of the X server. Additional info: You won't notice this problem much because most programs these days don't use the X11 borders feature anymore :)
Created attachment 306438 [details] C Xlib program that draws a window with 2 bordered children that can be used to easily see the child border redraw problem.
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