Twiny

[mmikhasenko]

adds twiny() function that is analogous to twinx()
Close #2579

[codecov]

Codecov Report

Merging #3532 (e83c6e6) into master (e43f3ee) will decrease coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3532      +/-   ##
==========================================
- Coverage   64.35%   64.25%   -0.11%     
==========================================
  Files          27       27              
  Lines        6612     6621       +9     
==========================================
- Hits         4255     4254       -1     
- Misses       2357     2367      +10     

Impacted Files	Coverage Δ
src/Plots.jl	31.42% <ø> (ø)
src/layouts.jl	62.19% <0.00%> (-1.40%)	⬇️
src/types.jl	47.82% <0.00%> (-4.35%)	⬇️

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[isentropic]

I think we can merge this right away if we have the accompanying docs. Since twinxis not even oficially documented, would you please add a new subsection under http://docs.juliaplots.org/latest/layouts/#Adding-Subplots-incrementally and document a brief usage of twinx, twiny? Once the corresponing PR with docs lands to PlotDocs repo we can merge both right away.

[BeastyBlacksmith]

I am actually a bit hesitant here, because twinx is causing a lot of trouble (which may be why it is undocumented so far). I'd prefer having the "providing additional scales" sorted out before adding more of them

[isentropic]

That's fair, let's hold on this then

[mmikhasenko]

@BeastyBlacksmith
Are issues with twinx collected somewhere?

• I noticed that it does not work correctly with pgfplotsx(), particularly with the heatmap

[BeastyBlacksmith]

https://github.com/JuliaPlots/Plots.jl/issues?q=is%3Aissue+is%3Aopen+twinx

[t-bltg]

Superseded by #4488.