Describe the bug

Loading a large model developed with previous Gaphor versions (11815 elements). Several connector elements in the model are dangling. Dragging the dangling item to a diagram gives an error. These items can't be deleted (delete key or right-click).

To Reproduce

Steps to reproduce the behavior:

1. Run poetry run gaphor / Open Gaphor
2. Open model
3. See lots of blank items

Expected behavior

Dangling items should not be present.

Screenshots

Error when dragging to screen:

(gaphor:12688): Gdk-CRITICAL **: 11:04:59.086: _gdk_macos_surface_update_fullscreen_state: assertion 'GDK_IS_MACOS_SURFACE (self)' failed

Note: the following bug shows on the terminal during startup with poetry:
UNSUPPORTED (log once): POSSIBLE ISSUE: unit 1 GLD_TEXTURE_INDEX_2D is unloadable and bound to sampler type (Float) - using zero texture because texture unloadable

OS

• Linux (Please put in notes the specific distro)
• macOS (M2 Pro, Sonoma 14.5)
• Windows

Version

Version of Gaphor: 2.26 (and develop)

Additional information

Add any other context about the problem here.