Message pane contents don't wrap when resizing window

[ghost]

When resizing the Thunderbird window, the contents of the message pane don't wrap (the pane to the right of the message list, particularly in vertical view). This means that the user must scroll across right to view the entire message.

Steps to reproduce:

1. Install Adwaita Thunderbird theme
2. Click: View -> Layout ->Vertical View
3. Click once on a plain text or HTML message with content without line breaks. The message does not wrap in the message pane - the user must scroll to the right in the message pane

Expected result:

• Message should wrap. The message does wrap when using the default Thunderbird theme.

Using:

• Adwaita-Thunderbird 1.0.1
• Thunderbird 8.0, Linux

[mangas]

This also happens with thunderbird 11.0.1, Fedora