bug#28809: 26.0.90; Error running timer ‘image-dired-thumb-queue-run’

[Eli Zaretskii]

> From: Davor Rotim <rotim.davor@gmail.com>
> Date: Fri, 13 Oct 2017 15:33:24 +0200
> 
> Started with emacs -Q, opened a dired buffer, navigated to an image and 
> pressed C-t .
> on it (image-dired-display-thumb) to generate a thumbnail. That leaves me 
> with only an error message:
> 
> Error running timer ‘image-dired-thumb-queue-run’: (range-error "floor" 
> 1505334534.0059688)

Mark, could you please look at this?  You changed the code to use
floor instead of rounding via format "%.0f", but floor returns an
Emacs integer which can overflow on 32-bit hosts for large time
values, as happens here.  I think we should use ffloor instead, and if
that produces a decimal point, eliminate it with "%.0f" format.

TIA