BUG: seam allowance on sleve breaks layout

[richardhenwood]

• Describe the bug

Including the seam allowance on the sleve of the male_shirt.sm2d causes the layout include the sleve block overlaid.

• How To Reproduce the bug

Load the current release (as of today) Linux AppImage. Download the included 'male_shirt' pattern and measurements from:

• https://github.com/FashionFreedom/Seamly2D/raw/refs/heads/develop/src/app/share/samples/patterns/male_shirt.sm2d
• https://github.com/FashionFreedom/Seamly2D/raw/refs/heads/develop/src/app/share/samples/measurements/individual/male_shirt.smis

Select: Piece
Select: Layout, and accept the defaults.
Observe sleve block overlaid on other, correctly layed out, blocks:

• What should have happened

The sleve block should not be overlaid over other blocks. Note: if you select the Sleve block in Piece, and unselect the 'Show Seam Allowance' option, the block is laid out correctly:

• Screenshots

See above

• What's your Desktop OS? Windows 11

Fedora 41 x86

• What's your Seamly version from Help/About? Seamly 2023.2.2.2156

Seamly: 2025.1.27.201

[richardhenwood]

I think I have a workaround for this particular pattern. I adjusted the 'Angle' of the nodes seam allowance to be 'by first edge right angle':

I don't know what that means or why it works but the layout works as expected for me but it unblocks me. This modification made in the GUI translates into <node angle="4" idObject="283" type="NodePoint"/> in the pattern XML. I will raise a PR.