Vertical Slice: populate timeline

[Ichthyostega]

Create Timeline UI from Diff Messages

this is a tracking ticket...

As Lumiera Architect,
I want the Timeline UI to receive and adapt to arbitrary content sent as Diff Message,
to allow independent evolution of the UI and the Session functionality

Implementation tasks

• lay the groundwork for the new flexible Timeline UI
• implement how the timeline in UI gets populated with content
  • set up the fork of tracks
  • inject clips into the fork
• define the base for flexible layout adjustments

[Ichthyostega]

this is the overarching topic since some time...

• Diff-Framework and UI-Bus are integrated
• we have a test-control (Help menu) to trigger some dummy-actions
• these dummy actions now push up a minimal Diff, which is dispatched properly and interpreted within InteractionDirector, delegating to the TimelineWidget and TimelineController
• after allocating a docking pane, the TimelineWidget opens a new Tab for each timeline, and creates the basic nested implementation structur

this is where we are right now.... we need to fill those structures with actual sub-widgets and start to draw the proper structures on the custom drawing canvas

[Ichthyostega]

Work on this »Vertical Slice« integration is almost complete by now; we have to round out some follow-up aspects though.

I have rewritten the spec for this long running driver task, to make the intended scope explicitly clear; it was not meant to build the complete Timeline UI in one step, rather we'll need several rounds of integration. Moreover, it turned out we also do not need a mocked session yet, since it suffices to send fabricated Diff messages into the UI-Bus (see #1153)

[Ichthyostega <prg@…>]

In 28331f9/Lumiera:

Timeline: complete the rework of UI backbone and Timeline (closes: #1014)

check private notes and mindmap and fix some remaining minor inconsistencies,
notably the calculations in the overlay renderer in the BodyCanvasWidget.

[Undercover Agent]

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