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Fixes #6772 When detaching an existing edge by grabbing by a source port, the node's code is no longer immediately modified. It is only changed once the edge has been either connected or destroyed. When grabbing on the source side, the existing behavior is preserved. That way, we always have guaranteed place to keep the edge connected to. https://github.com/enso-org/enso/assets/919491/49e560cb-0a29-4c6a-97ec-4370185b8c89 In general, the detached edges are now more stable, resilient to all kinds of expression modifications during the drag. https://github.com/enso-org/enso/assets/919491/e62450ff-46b2-466f-ac33-f4f19e66ee1d In case there is a situation where the currently dragged edge's port is destroyed (e.g. by Undo/Redo), instead of showing glitched port position it is simply dropped. https://github.com/enso-org/enso/assets/919491/8fb089aa-a4a5-4a8c-92eb-23aeff9867b8 # Important Notes The whole edge connection and view handling at the graph-editor view level has been completely rewritten. The edge endpoints are now identified using new `PortId` structure, that is not dependant on the span-tree. This prepares us for eventual removal of the span-tree in favour of manipulating AST directly. Right now those `PortId`s are still stored within the span-tree nodes, but it will be easy to eventually generate them on the fly from the AST itself. The widget tree has also already been switched to that representation where appropriate. Additionally, I have started splitting the graph editor FRP network into smaller methods. Due to its absolutely enormous size and complexity of it, I haven't finished the split completely, and mostly edge-related part is refactored. I don't want to block this PR on this any longer though, as the merge conflicts are getting a bit unwieldy to deal with. |
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