Blender Git Loki

Fix T82341: Warning in terminal during property search

After recent changes to the context panel layout (rB187cc5e26d28b1a8),
there has been an error printed when running propery search:

> Error: separator_spacer() not supported in popups.

The layout code thinks it's drawing in a menu because region->visible
isn't properly set for the other tab searches. This patch sets that field
for the temporary searching region, but it also disables searching in the
context breadcrumbs panel, because at best this will just give results
for the names of the active object, etc. This isn't helpful since
those labels are mostly in every tab anyway.

Differential Revision: https://developer.blender.org/D9425