Expected Behavior

CodeArea always showing caret (scrolling to visible) on keyboard moving (left/right buttons)

Actual Behavior

CodeArea not showing caret on keyboard moving (left/right buttons). Scroll begin moving only after few keyboard "right" button clicks, looks depended on LineNumberFactory nodes width

Reproducible Demo

• Your default JavaKeywordsDemo.java
• Run and change window width for showing horizontal scroll bar
• 
• Set caret position to the end of the line that is not fully visible and tries move with the keyboard to the right
• Visible area begin moving only after few buttons button clicks

Environment info:

• RichTextFX Version: 0.10.6
• Operating System: Windows 10
• Java version: 1.8.0_112