[vlc-devel] [PATCH] qt: fix hiding empty groupboxes

[Lyndon Brown]

from the commit log:
-----------------------

qt: hide all empty groupboxes

if a panel only has one groupbox and it is empty, it was hidden, but
otherwise they were shown; this was surely a bug, and at any rate is
undesirably messy. all empty groupboxes are now hidden.

an example case: this fixes the empty "Performance options" groupbox
(on my system) under the top-level "Advanced" tree node in the advanced
preferences view, which happens to be very visible as the first panel
shown when switching to advanced mode.
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