Terminal: Text does not wrap properly in DOM mode

[jtanx]

• VSCode Version: 1.25.1
• OS Version: Windows 10 1703

Steps to Reproduce:

1. Open a file in less that has a line long enough that it will wrap, e.g.:

   ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ ABCDEFGHIJKLMNOPQRTSUVWXYZ
   

2. Observe that in canvas mode, it wraps properly. But in DOM mode, it does not wrap properly - the start of the continuation is as if it were still in canvas mode, but because of a differing text width in dom mode, the first line gets cut off too soon, and the wrapped part doesn't show this.

Canvas mode:

DOM mode:

Does this issue occur when all extensions are disabled?: Yes

[Tyriar]

Duplicate #51479