[folding] unfold when pressing enter on last line

 Issue Type: <b>Bug</b> Hi, After collapsing a Command (with code in) I can't enter after that. In this example I can't enter between fds en the comment. VS Code version: Code 1.21.1 (79b44aa704ce542d8ca4a3cc44cfca566e7720f1, 2018-03-14T14:47:13.351Z) OS version: Windows_NT ia32 10.0.17134 <details> <summary>System Info</summary> |Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 x 4008)| |Memory (System)|15.92GB (8.93GB free)| |Process Argv|E:\ProgramFiles(x86)\Microsoft VS Code\Code.exe| |Screen Reader|no| |VM|0%| </details><details><summary>Extensions (1)</summary> Extension|Author (truncated)|Version ---|---|--- LiveServer|rit|5.0.0 </details> Reproduces only with extensions <!-- generated by issue reporter -->