Take in to account virtual nodes when hydrating an existing DOM structure

[agubler]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

Virtual nodes should be treated the same as widgets when it comes to hydrating an existing DOM node structure. This means passing the merge node candidates down to when a virtual node is met.

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[codecov]

Codecov Report

Merging #896 (b1ee4d9) into master (36aae1a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #896   +/-   ##
=======================================
  Coverage   94.54%   94.54%           
=======================================
  Files         127      127           
  Lines        8121     8123    +2     
  Branches     1896     1898    +2     
=======================================
+ Hits         7678     7680    +2     
  Misses        443      443           

Impacted Files	Coverage Δ
src/core/vdom.ts	97.78% <100.00%> (+<0.01%)	⬆️

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