evolve: remove meaningless transaction nesting
Before this patch, functions below nest transaction scope, even though
they are invoked only inside a transaction scope created at _solveone().
- _solvebumped()
- _solvedivergent()
- relocate() via _solveunstable() or _solvebumped()
Transaction nesting is useful for localizing "success" (e.g. one scope
per commit inside wider scope for multiple committing).
But such nesting is redundant for _solveone(), because there is no
code path, which causes failure after successfully closing inner
transaction(s).
In addition to it, this nesting makes it complicated to close current
transaction successfully with exception raising inside inner scope,
like "hg shelve" at detection of conflicts. "tr.close()" is required
at each outer scopes for such case.
To remove meaningless transaction nesting, this patch replaces
repo.transaction() in functions above by repo.currenttransaction().
This reuses transaction created at _solveone().
This patch also adds 'assert tr' after getting current running
transaction, to avoid invocation of functions above without
transaction.
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