Demonstrate lazy tabs

[philippjfr]

Fixes #1933

[codecov]

Codecov Report

Merging #2479 (2751dd9) into master (b73a499) will decrease coverage by 0.31%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2479      +/-   ##
==========================================
- Coverage   83.28%   82.97%   -0.32%     
==========================================
  Files         184      184              
  Lines       23134    22680     -454     
==========================================
- Hits        19268    18818     -450     
+ Misses       3866     3862       -4     

Impacted Files	Coverage Δ
panel/param.py	87.32% <100.00%> (-0.12%)	⬇️
panel/auth.py	35.87% <0.00%> (-3.29%)	⬇️
panel/pane/ipywidget.py	47.05% <0.00%> (-2.95%)	⬇️
panel/config.py	57.35% <0.00%> (-2.86%)	⬇️
panel/io/reload.py	63.95% <0.00%> (-2.72%)	⬇️
panel/tests/template/test_manual.py	59.13% <0.00%> (-2.48%)	⬇️
panel/io/state.py	58.62% <0.00%> (-2.31%)	⬇️
panel/pane/plot.py	55.61% <0.00%> (-2.14%)	⬇️
panel/pane/streamz.py	65.71% <0.00%> (-1.86%)	⬇️
panel/models/echarts.py	85.71% <0.00%> (-1.79%)	⬇️
... and 90 more

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