File from non-active change list is modified

I've opened my project in the morning and this line appeared in the Gradle app module.

There are three options : Move changes, Save Changelist and Ignore.

Does someone have an idea what's wrong and what I should do?

What is changelist in Git?

A changelist is a set of local changes that have not yet been committed to a VCS repository. With changelists, you can group changes related to different tasks and commit these sets of changes independently.

How to remove files from default changelist intellij?

Right click on the file in the version control window and select "Ignore...". Then select the relevant option (ignore file, directory or all files matching).

How to see changelist in intellij?

Use ⌘0 (macOS) or Alt+0 (Windows/Linux), to show the Commit tool window. Changes in the Commit Tool Window are in the default active changelist. The active changelist is highlighted in bold.

There was a open bug in IDEA regarding this issue:

IDEA-51396 Tasks: if conflicted file is opened in 2 editor tabs, tasks toolbar actions (switch changelist/move changes/ignore) don't make toolbar disappear

It's the IDE behaviours and you don't have to worry about it at all.

Choose what options suits you the best and continue your work.