bug#30182: Update

[martin rudalics]

> On master branch, emacs crashes when moving the mouse pointer
> across the modeline.

> The crash doesn't happen if this commit is reverted:
>
> commit e462308f03c9c16c47abc82d6f339ca9d18898f9
> Author: Martin Rudalics <rudalics@gmx.at>
> Date:   Thu Jan 18 10:36:47 2018 +0100
>
>      Fix some tooltip related problems

Just to eliminate one possible cause: Does the bug disappear when you
customize `mode-line-default-help-echo' to the default value of the
'string' alternative?

Thanks, martin