At work I have switched from XEmacs to GNU Emacs for various reasons. I use ediff a LOT. With XEmacs, the ediff popup gets the focus but not so with GNU Emacs. The focus always stays in the bottom right window. So I end up with a lot on n characters in that windows (ediff users will understand).
Here is the xprop and xwininfo output from Emacs (I cut out the icon): WM_STATE(WM_STATE): window state: Normal icon window: 0x0 WM_HINTS(WM_HINTS): Client accepts input or input focus: True Initial state is Normal State. bitmap id # to use for icon: 0x20000de bitmap id # of mask for icon: 0x20000e4 window id # of group leader: 0x2000001 _MOTIF_DRAG_RECEIVER_INFO(_MOTIF_DRAG_RECEIVER_INFO) = 0x6c, 0x0, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 XdndAware(ATOM) = BITMAP _NET_WM_ICON(CARDINAL) = Icon (48 x 48): <cut out actual icon> _NET_WM_OPAQUE_REGION(CARDINAL) = 7, 0, 130, 7, 0, 7, 144, 35 _NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_NORMAL _NET_WM_SYNC_REQUEST_COUNTER(CARDINAL) = 33554612, 33554613 _NET_WM_USER_TIME_WINDOW(WINDOW): window id # 0x20000b3 WM_CLIENT_LEADER(WINDOW): window id # 0x2000001 _NET_WM_PID(CARDINAL) = 18570 WM_LOCALE_NAME(STRING) = "C" WM_CLIENT_MACHINE(STRING) = "zonker" WM_NORMAL_HINTS(WM_SIZE_HINTS): user specified location: 0, 0 program specified location: 0, 0 program specified minimum size: 8 by 14 program specified resize increment: 8 by 14 program specified base size: 8 by 14 window gravity: NorthWest WM_PROTOCOLS(ATOM): protocols WM_DELETE_WINDOW, WM_TAKE_FOCUS, _NET_WM_PING, _NET_WM_SYNC_REQUEST WM_CLASS(STRING) = "Ediff", "Emacs" WM_ICON_NAME(STRING) = "Ediff _/4" _NET_WM_ICON_NAME(UTF8_STRING) = "Ediff _/4" WM_NAME(STRING) = "Ediff" _NET_WM_NAME(UTF8_STRING) = "Ediff" xwininfo: Window id: 0x20000b2 "Ediff" Absolute upper-left X: 856 Absolute upper-left Y: 1 Relative upper-left X: 856 Relative upper-left Y: 1 Width: 144 Height: 42 Depth: 24 Visual: 0xf4 Visual Class: TrueColor Border width: 1 Class: InputOutput Colormap: 0x200001b (not installed) Bit Gravity State: NorthWestGravity Window Gravity State: NorthWestGravity Backing Store State: NotUseful Save Under State: no Map State: IsViewable Override Redirect State: no Corners: +856+1 -918+1 -918-1035 +856-1035 -geometry 17x2+856+1 The main difference I can see from XEmacs is the WM_SIZE_HINTS. XEmacs has a more "normal" looking output. The other hint is that when Emacs creates the ediff window it is seen briefly in the lower right corner as an empty window then moves. With XEmacs it is briefly at the right spanning the two right windows. Any ideas of where to start looking would be greatly appreciated! This is 100% reproducible, so it is easy to get debug information. Cheers, Sean