Application hangs during analyzing of text

[NeoCoderMatrix86]

Describe the bug
The application hangs when a large text is analyzed during the import. Please add a loading animation.

To Reproduce
Steps to reproduce the behavior:

1. Import a text file like

Textimport with Cuesheetdata.txt

2. Select the import profile 'Textfile (common data in first line)'
3. Change the common scheme to match the file
4. See application hangs during every analyze.

Expected behavior
Smooth working with the application or a loading animation.

[NeoCoderMatrix86]

Currently not reproducable, application doesn't hang during analyze.