Jordan Hrycaj 90dd86be9a Fc module can update base also when on parent arc (#2911) ... * Re-org internal descriptor `CanonicalDesc` as `PivotArc` why: Despite its name, `CanonicalDesc` contained a cursor arc (or leg) from the base tree with a designated block (or Header) on its arc members (aka blocks.) The type is used more generally than only for s block on the canonical cursor. Also, the `PivotArc` provides some more fields for caching intermediate data. This simplifies managing extra arguments for some functions. * Remove cruft details: No need to find cursor arc if it is given as function argument. * Rename prototype variables `head: PivotArc` to `pvarc` why: Better reading * Function and code massage, adjust names details: Avoid the syllable `canonical` in function names that do not strictly apply to the canonical chain. So renaming * findCanonicalHead() => findCursorArc() * canonicalChain() => findHeader() * trimCanonicalChain() => trimCursorArc() * Combine `updateBase()` function-args into single `PivotArgs` object why: Will generalise action for more complex scenarios in future. * update `calculateNewBase()` return code type => `PivotArc` why: So it can directly be used as argument into `updateBase()` * Update `calculateNewBase()` for target on parent arc * Update unit tests		2024-12-05 13:01:57 +07:00
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chain_debug.nim	Fc module can update base also when on parent arc (#2911)	2024-12-05 13:01:57 +07:00