534677 - Can't Copy (Cmd-C) message Subject line when selected

Status: RESOLVED DUPLICATE of bug 520391

(Thunderbird :: Message Reader UI, defect)

Description

[Brad]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 Glubble/2.0.5.0
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.5) Gecko/20091204 Lightning/1.0b1pre Thunderbird/3.0

If you highlight some of the words in the message Subject line,
it is not possible to copy the selection.  The Edit->Copy command is 
disabled (Paste is enabled for some reason), and using context-menu on
the Subject line always copies the entire subject.

Reproducible: Always

Steps to Reproduce:
1. Select a message
2. Select and highlight some words in the subject field of the message pane.
3. Try to Copy the selected text with Cmd-C or Edit->Copy
Actual Results:  
Copy is not enabled for the Subject line.

Expected Results:  
The clipboard should contain the selected text.

This capability was available in Thunderbird 2.