[rinekri]

Removes the workarounds the apps needed for tabs built on parallelFlow, and fixes the parallel-flow bugs found while migrating them.

Added

• Gradle plugin: a flavor or build type .dot file with mode = "extend" adds nodes and edges to the schema with the same graph id instead of replacing it, so the schema is not copied into the flavor's source set.
• Path.endsWith(target: Target) instead of a string comparison of the last segment.
• ParallelFlowNode.initialRegions, startRegion, isRegionStarted: regions which are not initial have no nodes until they are started, so tabs can load on the first selection without placeholder nodes. isRegionAtRoot makes the state of a region readable in transition().
• BaseParallelFlowNode: a parallel flow node with hooks.
• way-compose: FocusedRegionHost(regionId) renders one region of a parallel node and keeps the saved state of the other ones; rememberTransitionSpec() with push, pop, fade and no-op transitions.

Changed

• way-compose hosts start from the current state of the service, so a host which enters composition later shows its node on the first frame.
• Extension point and hook interfaces have empty default implementations.
• The regions of a parallel declared inside of a region start when the parallel is entered and are removed when it is left.
• A node which is entered is built once per transition.
• NodeBuilder has snapshotCache and restoreCache; a hand-written builder which caches child builders should override them.

Fixed

• Entry and exit order of parallel flows and their regions, including nested ones and the ones entered by NavigateTo.
• Back delivered to every region, or twice, for a parallel declared under a flow.
• Wrong paths from RegionId.resolveAbsolute and from relative targets inside of a parallel.
• A schema whose root is a flow with a parallel declared under it failed at start.
• A failed transition now restores the state, the node builder cache and the event queue before nodes are entered back, and a node whose onEntry threw gets onExit.

The full list is in CHANGELOG.md.

Source-breaking: a ParallelFlowNode subclass which declares a member named initialRegions, startRegion, isRegionStarted or isRegionAtRoot has to rename it.

Checked with :way:allTests, :way-gradle-plugin:test, :way-compose:testDebugUnitTest, and with six apps built against the local artifacts and run on an emulator.

Bumps the version to 0.11.0.