Expose widgets visible property

[xavArtley]

fix #2052

[codecov]

Codecov Report

Merging #2065 (32b3269) into master (709ef9b) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2065      +/-   ##
==========================================
+ Coverage   84.42%   84.43%   +0.01%     
==========================================
  Files         178      178              
  Lines       20636    20638       +2     
==========================================
+ Hits        17421    17425       +4     
+ Misses       3215     3213       -2     

Impacted Files	Coverage Δ
panel/tests/test_reactive.py	98.90% <100.00%> (+0.01%)	⬆️
panel/widgets/base.py	94.66% <100.00%> (+0.07%)	⬆️
panel/io/reload.py	66.66% <0.00%> (+2.29%)	⬆️

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[philippjfr]

Thanks! Do you know if all widgets support this properly?

[xavArtley]

No, but I suppose tests would have throw something if it wasn't available in bokeh properties

[MarcSkovMadsen]

One big, but invisible step for man :-) Thanks @xavArtley