Allow -1 in Tabs.active

[Hoxbro]

Fixes #4919

[codecov]

Codecov Report

Merging #4920 (11cfd6f) into main (0c9cce3) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4920      +/-   ##
==========================================
+ Coverage   83.43%   83.44%   +0.01%     
==========================================
  Files         270      270              
  Lines       38156    38156              
==========================================
+ Hits        31834    31838       +4     
+ Misses       6322     6318       -4     

Flag	Coverage Δ
ui-tests	40.89% <50.00%> (+<0.01%)	⬆️
unitexamples-tests	73.38% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
panel/layout/tabs.py	90.75% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[philippjfr]

Sounds good if it works!

[Hoxbro]

It does!

screenrecord-2023-05-23_15.52.26.mp4