[minor bug] analysis->protocols-> groups doesn't say closed/collapsed

[Nesos-ita]

Expected Behavior

closed/collapsed groups should stay closed.
if i click the small arrow to close/collapse a group of signal and i check/uncheck the checkbox of a signal to show/hide it a "closed" group should stay closed.

Actual Behavior

clicking on a checkbox (group or single signal) opens all the groups (showing the signals inside it) defeating their purpose of keeping things tidy.
(the checkboxes works good, what is not checked is not visible in the right panel)
i hope is clear what i mean, if not let me know.

Steps to Reproduce the Problem

1. make two groups A and B
2. add some signals in them
3. click on the small arrow to close/collapse group A
4. click on the checkbox of group B or a signal in broup B
5. the group A is not anymore collapsed

Platform Specifications

• Python Version: Python 3.6.2 (not in %PATH%) Python 2.7.12 (in %PATH%)
• Operating System: windows 8.1 x64
• Version of URH: 1.8.7
• URH was installed: via .msi