Zones plugin: Thumbnail only becomes visible when handle is moved
The zones plugin initially does not show the thumbnail that allows to identify zones. - This only becomes visible when a change is made.
See also #8646
#1 Updated by Simon Spannagel about 8 years ago
this is somehow different from #8646. while the latter one is clearly a bug this one here behaves as intended.
The problem is that you can't just display the zone system "thumbnail" but you have to process the picture to get these informations. So showing this all the time means having an additional plugin in pipe (and processing the pipe" without the need of the plugin for most of the time. So this is processed as soon as you enable the plugin (either by explicitely enable or by moving a control which enables the plugin as well) but not before.