[Tcl-bugs] [Tk Source Code] Ticket [c95d4691ff8723b4|c95d4691] winfo screenheight w/dual monitors returns the screen height of the primary display status still Open with 3 other changes

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Ticket Change [a365ded23640ac8aebfd98906447ab0b0c8bc6e1]
  [Ticket [c95d4691ff8723b4|c95d4691] winfo screenheight w/dual monitors returns the screen height of the primary display status still Open with 3 other changes]
  By      fvogel
  For     Tk Source Code
  On      2016-05-22T14:43:40.504
  Details http://core.tcl.tk/tk/tinfo?name=a365ded23640ac8aebfd98906447ab0b0c8bc6e1
  Ticket  http://core.tcl.tk/tk/tktview/c95d4691ff8723b47c820081ce50688cf04911f7

Changed Fields
  icomment: Brad, about your comment below dated 2016-04-23 16:51:07:

            I don't see this as wrong. With xrandr you set one *single* big
            screen, not two. The two monitors make up a single screen as far as
            the X server is concerned.

            On Linux I have made a bit of research in the code, and it's quite
            simple: XOpenDisplay() does the entire job, checks for different
            screens presence and so on. You can check how many screens it finds by
            applying the following little patch:

            Index: generic/tkWindow.c
            ==================================================================
            --- generic/tkWindow.c  +++ generic/tkWindow.c  @@ -530,10 +530,11 @@
            if ((strncmp(dispPtr->name, screenName, length) == 0)  &&
            (dispPtr->name[length] == '\\0')) {  break;  }  }
            +printf("ScreenCount(dispPtr->display): %d\ ",
            ScreenCount(dispPtr->display));  if (screenId >=
            ScreenCount(dispPtr->display)) {  Tcl_SetObjResult(interp,
            Tcl_ObjPrintf(  "bad screen number \\"%d\\"", screenId));
            Tcl_SetErrorCode(interp, "TK", "DISPLAY", "SCREEN_NUMBER", NULL);
            return NULL;

            I have now built a real (i.e. not in a VM) Linux Debian 8
            configuration with two monitors just to investigate the present
            ticket, and like you I only have one screen reported by X.

            I think that configuring X differently, so that instead of one big
            screen it sees two separate screens should be possible (how? tune
            xorg.conf?)  Then in Tk the behaviour should be already OK with no
            change in the Tk code. I do not think Tk has a bug (in the Linux
            implementation).
  login:    fvogel

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