Boards manager: wrong description shown

[ffissore]

Say you have a core with 3 versions: version 1 supports board A, version 2 supports board A and B, version 3 supports boards A, B and C. You have installed version 3. You open boards manager and it lists boards A and B from version 2. You select version 1 from the dropdown: you'll keep on seeing boards A and B.

Sync boards/lib manager so that they show the data from the selected version, not just from the latest

[per1234]

I created a test JSON index file to demonstrate this(I didn't realize you had already spotted it):
https://raw.githubusercontent.com/per1234/misc/test/package_per1234_test_index.json
So just in case additional info helps to track down the bug:

• When 1.0.0 is installed the name, boards and Online help links are from 1.0.1:
  
• After installing v1.0.1 but before clicking on the Boards Manager entry the information is correct:
  
  But then when you click on it you get the 1.0.0 name, boards and Online help link:
  

EDIT 2017-07-09: Problem still occurs in Arduino IDE 1.8.3