Divider fill has no effect

[ihorwill]

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Describe the bug
The "divider" component of a UML class shape remains transparent even if the "fill" option is ticked.

To Reproduce
Steps to reproduce the behavior:

1. From the UML shapes group, add a "class" shape to a new diagram.
2. Click on the divider between the default "field" and "method" boxes.
3. Select the "fill" option in the Style tab.
4. The divider remains transparent: the diagram background can be seen in the small spaces above and below the line.

Expected behavior
A fill colour should be used so that the background does not show through.

Screenshots

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version 24.7.17

Desktop (please complete the following information):

• OS: Windows

Additional context
N/A