endFormObject with duplicate id leaves jsPDF in a bad state

[HackbrettXXX]

https://github.com/MrRio/jsPDF/blob/e988a043bc6a26957798ce48e6f12e0b96b8b803/src/jspdf.js#L5690-L5707

The early exit must also pop the stack.

See also the original issue: yWorks/svg2pdf.js#166

[Qendolin]

Sounds like it can be fixed very easily.

Replace

if (renderTargetMap[key]) return; 

With

if (renderTargetMap[key]) {
  renderTargetStack.pop().restore(); 
  return:
}

I'ld love for this to get fixed very soon, it's a very problematic issue.

[HackbrettXXX]

@Qendolin could you prepare a pull request? Would be awesome.

[Qendolin]

I'll try

[HackbrettXXX]

Fixed in #3135.