Optimize flowchart algorithm to handle edges spanning multiple rows/layers in horizontal orientation

[rashidakanchwala]

Description

This is a spike issue; the current flowchart algorithm isn't fully optimized to handle edges between nodes that span multiple rows/layers. While some optimization has been implemented for the vertical orientation, the horizontal orientation still lacks a similar way to minimize unnecessary edge crossings and improve clarity.

Expected Behavior

• Edges should be routed efficiently in horizontal orientation.
• Reduce unnecessary edge crossings.
• Maintain a clean and readable layout.

Current Behavior

• Some edges in horizontal orientation crisscross or take inefficient paths over multiple layers.
• The optimization applied to vertical orientation hasn't been extended to horizontal orientation.

Checklist

• Include labels so that we can categorise your feature request

[astrojuanlu]

(Would be good to have a reproducer or at least a screenshot of how this looks like, easier to see in the left-to-right mode)