Unable to enter multi-valued parameters

[GoogleCodeExporter]

What steps will reproduce the problem?
1. On the Parameters tab, enter Name: hobby, Value: tennis.
2. Click Add/Change button.
3. Enter Name: hobby, Value: cooking.
4. Click Add/Change button.

What is the expected output? 
I should get two name-value pairs listed: hobby=tennis and hobby=cooking. 
Besides, on the "Content to Send" tab, if I click on the "Body from Parameters" 
tab, I should get "hobby=tennis&hobby=cooking" displayed beneath.

What do you see instead?
hobby=cooking only. Only the last parameter value is kept.

What version of the product are you using? 
3.0.0

On what operating system?
Windows XP

Multi-valued parameters are required to simulate submitting forms with 
multiple-selection listboxes.

Original issue reported on code.google.com by cyril.da...@gmail.com on 31 May 2011 at 1:49

[GoogleCodeExporter]

There is the same issue for headers.  I will be adding a double-click action to 
allow multi-line editing.

Original comment by a...@milowski.com on 11 Oct 2011 at 8:02

• Changed state: Accepted
• Added labels: Type-Enhancement
• Removed labels: Type-Defect

[GoogleCodeExporter]

{
"hobby":["cooking","tennis","etc"],
}

I was able to enter this manually before but the new interface does not allow 
for arrays.

Original comment by paik...@gmail.com on 15 Jun 2015 at 1:28