BUG #14282. Fix long labels on Properties panel.

Fixed size policy on label to ensure that the Properties panel doesn't end up
requiring more horizintal space just because the label (that uses the proxy's
name) is too long.

Change-Id: If6ba4b976ed0f0ce685c0768640eb596a2cdbd1c
Merge topic '14282_fix_long_label' into next

2919efd BUG #14282. Fix long labels on Properties panel.