Line number display is not updated when switching tabs

[per1234]

Using Arduino IDE 1.8.10 hourly build 2019/07/23 / Arduino IDE 1.9.0-beta build 113, Windows 10 64 bit

1. Open a sketch with multiple tabs (I'll refer to them as "tab A" and "tab B") in the Arduino IDE.
2. Check File > Preferences > Display line numbers.
3. Move the cursor on tab A to a different line number than the current cursor location on tab B.
4. Switch from tab A to tab B. The line number shown at the bottom left corner of the Arduino IDE window still shows the line number from tab A.

Originally reported at:
https://forum.arduino.cc/index.php?topic=630916