TabGroup.viewColumn and Editor.viewColumn are out of sync for the same editor.

[tsmaeder]

Bug Description:

When starting up typescript-language-features 1.881 the context key typescript.isManagedFile is never set. Analyzing the problem led to finding out that the extension fails to find the active typescritpt editor due to this comparison failing for the single open editor:

editor.viewColumn === tab.group.viewColumn;

editor.viewColumn is one and tab.group.ViewColumn is 2, but there is only one editor open.

Steps to Reproduce:

n/a

Additional Information

• Operating System: Windows 11
• Theia Version: Theia 1.49 master

[tsmaeder]

Remove the workaround from #13673 once we have a fix here.