dotnet commands modify the terminal's keypad/cursor behavior, but does not restore it on exit

[Frassle]

Resurrection of microsoft/dotnet#472

If I run read and push the four arrow keys I get "^[[A^[[B^[[C^[[D". If I run dotnet build and then run read and push the arrow keys again I get "^[OA^[OB^[OC^[OD". I have to run tput rmkx to return my terminal to normal.

$ read
^[[A^[[C^[[B^[[D^C
$ dotnet build
Welcome to .NET 5.0!
---------------------
SDK Version: 5.0.101
.....

$ read
^[OA^[OC^[OB^[OD^C
$ tput rmkx
$ read
^[[A^[[C^[[B^[[D^C

Note that just dotnet alone doesn't seem to trigger it, but it seems any other invocation does (e.g. dotnet --help, dotnet build)

And the output of dotnet --info to show which dotnet was running:

$ dotnet --info
.NET SDK (reflecting any global.json):
 Version:   5.0.101
 Commit:    d05174dc5a

Runtime Environment:
 OS Name:     ubuntu
 OS Version:  18.04
 OS Platform: Linux
 RID:         ubuntu.18.04-x64
 Base Path:   /usr/share/dotnet/sdk/5.0.101/

Host (useful for support):
  Version: 5.0.1
  Commit:  b02e13abab

.NET SDKs installed:
  2.1.810 [/usr/share/dotnet/sdk]
  3.1.402 [/usr/share/dotnet/sdk]
  5.0.101 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.22 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.22 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.8 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.22 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.8 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download