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Current column allocation algorithm is too straightforward. It results in following issues.
Graph inclines towards one direction. I think symmetric DAG would appear more pretty.
Graph is spread enought after merging of many parallel branches. In such situation new branches may jump far enough from its forks because the fork column is far from 0 column and there is free column near 0.
The patch series targets mostly this issues.
Changing of graph alignment in commit 02818e2 breaks tag label overlapping prevention algorithm. The patch dd164d1 improves the algorithm to be adaptive to current graph alignment.