Bug report

Describe the bug

In v0.6, when using Objects > Annotations > Split annotations by lines, the tool doesn’t work properly if I have multiple lines and set Line thickness to 0 px.

Instead of splitting, the lines are just removed and the annotation isn’t split at all.

If I set thickness to any value greater than 0 px, it works fine. With a single line, 0 px also still works (like it did in v0.5). But with multiple lines at 0 px, it fails.

In v0.5, 0 px worked fine for both single and multiple lines.

To Reproduce

1. Draw an annotation.
2. Draw 2 or more lines across it.
3. Go to Objects > Annotations > Split annotations by lines.
4. Set Line thickness = 0 px.
5. Run the split → annotation isn’t split.

Expected behavior

Annotations should split correctly with multiple lines even when Line thickness = 0 px, same as in v0.5.

Screenshots

Desktop (please complete the following information):

• OS: [macOS Sequoia 15.5]
• QuPath Version: [0.6.0-arm64]

Additional context

Add any other context about the problem here.