Unable to select content from serial monitor

[eclipse1985]

Describe the bug
I want to perform a copy/paste operation from serial monitor output, but the selection disappear on the mouse up

To Reproduce
Steps to reproduce the behavior:

1. Print something on the serial monitor
2. Try to select some text

Expected behavior
Selection does not disappear

Screenshots
https://user-images.githubusercontent.com/6736700/109802275-e1db2d00-7c1f-11eb-8e38-022a2275b8ed.mov

Desktop (please complete the following information):

• OS: MacOS
• Version: Mojave 10.14.6 (18G8012)

Additional context
Even with auto-scroll on and off

[per1234]

This bug is now being tracked at #247