@MrChebik Thanks for the patch and pull request, however your changes causes the following two tests to fail:

1. PositionTests.end_position_is_correct_when_change_occurs_at_position @ line 137
2. PositionTests.end_position_is_correct_when_change_occurs_after_position @ line 153

Please review your fix so that all tests pass :-)
Thank you.

@Jugen Tests are now passing .

Dear @Jugen!
When you approve this pull request?
This bug also bothers us.

Hi, @rustem-s, you can use forked project with bug fix.

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

// ...

<dependency>
    <groupId>com.github.MrChebik</groupId>
    <artifactId>RichTextFX</artifactId>
    <version>cabee30961</version>
</dependency>