Various fixes for resolution of links

[philippjfr]

No description provided.

[codecov-io]

Codecov Report

Merging #354 into master will decrease coverage by 0.33%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master     #354      +/-   ##
==========================================
- Coverage   86.99%   86.66%   -0.34%     
==========================================
  Files          88       88              
  Lines        7746     7783      +37     
==========================================
+ Hits         6739     6745       +6     
- Misses       1007     1038      +31

Impacted Files	Coverage Δ
panel/io/state.py	89.28% <0%> (ø)	⬆️
panel/layout.py	87.64% <100%> (+0.07%)	⬆️
panel/param.py	91.53% <25%> (-0.69%)	⬇️
panel/links.py	84.44% <75%> (-0.31%)	⬇️
panel/pane/vtk.py	27.89% <0%> (-2.43%)	⬇️

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