UI problem with long lines in templates

[ax-sc]

There seems to be a bug with handling long lines in templates.

steps to reproduce the bug:

1. Create a new document with a new template
2. Open the Template-Tab and write a line longer than the width of your screen.

observed behaviour:
The Template-Tab expands to the full width of the screen and the menu as well as the preview are not usable.

expected behaviour:
The width of the Template-Tab should be fixed to a maximum width, where the menu as well as the preview is still accessible.

[ax-sc]

This issue is also present in the Document-Tab, which shows the same behaviour for a long line in the content of a variable.

[ax-sc]

It seems like this issue is still present, but the behaviour has changed. When entering a long line (longer than the width of the Document- (or the Template-)Tab, the screen is split horizontally and the Preview-section is shown at the end of the page.

[ax-sc]

The issue only appears with lines containing no spaces. As this is unlikely to happen for standard-users, this issue is postponed to Backlog.