Horizontal scrolling of a CodeArea can result in large empty blocks in the upper right of the viewport

[swpalmer]

Expected Behavior

Viewport rendering should fill consistently regardless of scroll position or direction.

Actual Behavior

When scrolling content to the left sometimes large blocks in the upper right corner of the viewport are left blank

More visible with a dark background for the text lines.
Blocks start after last character on the line and extend to the edge of the viewport and down to where they hit a longer line.
See attached screenshot.

Environment info:

• RichTextFX Version: 0.10.7
• Operating System: macOS 12.2.1
• Java version: 17.0.2 with JavaFX 17 modules included (Zulu build from Azul)

[Jugen]

I suspect that this due to the behavior/dynamics of the Flowless library that RichTextFX uses.

[Jugen]

Kinda fixed by PR dealing with thin lines between cells, although empty blocks still flash briefly before being filled.