bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build

[Po Lu]

Po Lu <luangruo@yahoo.com> writes:

> Input extension builds do not normally report mouse-1 or mouse-3; that
> only happens if the input extension could not be set up for some reason.

Please ignore that, I wasn't really thinking when I wrote this.

Unfortunately, I cannot reproduce the bug on any build of Emacs.  Please
instrument the following code around line 21053 of xterm.c as follows:


                      /* See the comment on top of x_cache_xi_devices
                         for more details on how scroll wheel movement
                         is reported on XInput 2.  */
                      delta = x_get_scroll_valuator_delta (dpyinfo, device,
                                                           i, *values, &val);
                      values++;

                      if (!val)
                        {
                          other_valuators_found = true;
                          continue;
                        }

                      printf ("%g\n", delta); <=== add this instrumentation

                      if (delta != DBL_MAX)
                        {

and show what is printed when you try to scroll using the mouse.

Thanks.