Latest tabs changes leave XEmacs completely broken.

Beta testers, please do not update to the latest version from CVS. When I start up the latest XEmacs from CVS, a black frame is on the screen for 20 seconds or so, and then it crashes. It seems very likely that Andy's changes of today caused the problem. Andy, could you back out your change if you can't figure out what's going on fairly quickly, so that people can at least use CVS? gdb gives an enormous backtrace with thousands of stack frames that starts like this: #0 TabLayout (tw=0x855c750, wid=91, hgt=23, reply_height=0x0, query_only=0) at /xemacs/ws/dev/lwlib/xlwtabs.c:1676 #1 0x81eec8d in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:545 #2 0x81eee17 in TabsExpose (w=0x855c750, event=0x0, region=0x0) at /xemacs/ws/dev/lwlib/xlwtabs.c:591 #3 0x81eedd8 in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:573 #4 0x81eee17 in TabsExpose (w=0x855c750, event=0x0, region=0x0) at /xemacs/ws/dev/lwlib/xlwtabs.c:591 #5 0x81eedd8 in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:573 #6 0x81eee17 in TabsExpose (w=0x855c750, event=0x0, region=0x0) at /xemacs/ws/dev/lwlib/xlwtabs.c:591 #7 0x81eedd8 in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:573 #8 0x81eee17 in TabsExpose (w=0x855c750, event=0x0, region=0x0) at /xemacs/ws/dev/lwlib/xlwtabs.c:591 #9 0x81eedd8 in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:573 #10 0x81eee17 in TabsExpose (w=0x855c750, event=0x0, region=0x0) at /xemacs/ws/dev/lwlib/xlwtabs.c:591 #11 0x81eedd8 in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:573 #12 0x81eee17 in TabsExpose (w=0x855c750, event=0x0, region=0x0) at /xemacs/ws/dev/lwlib/xlwtabs.c:591 #13 0x81eedd8 in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:573 #14 0x81eee17 in TabsExpose (w=0x855c750, event=0x0, region=0x0) at /xemacs/ws/dev/lwlib/xlwtabs.c:591 #15 0x81eedd8 in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:573 #16 0x81eee17 in TabsExpose (w=0x855c750, event=0x0, region=0x0) at /xemacs/ws/dev/lwlib/xlwtabs.c:591 #17 0x81eedd8 in TabsResize (w=0x855c750) at /xemacs/ws/dev/lwlib/xlwtabs.c:573 Martin