Make sure that indirectly reexported modules also become chunk dependencies when preserving modules

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
Resolves #3113

Description

This makes sure that when a module A imports a variable that is reexported by a module B from another module C in two steps, i.e. first imported and then exported, and all three involved modules end up in different chunks, then the chunk of C becomes an actual dependency of the chunk of A.

This was a problem when preserving modules as here, transitive dependencies were never hoisted and some exports were suppressed.

[codecov]

Codecov Report

Merging #3273 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #3273   +/-   ##
=======================================
  Coverage   92.76%   92.76%           
=======================================
  Files         170      170           
  Lines        5943     5943           
  Branches     1796     1796           
=======================================
  Hits         5513     5513           
  Misses        225      225           
  Partials      205      205

Impacted Files	Coverage Δ
src/Module.ts	97.3% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6e92e52...74e13e0. Read the comment docs.