[cedricvogel-leo]

P34 C: «In IDE öffnen» and «IDE-Link kopieren» pass the block's features= on to the IDE (glpython-edu.github.io#41).

• With features=: the block's effective list (what it shows) goes into the IDE link's payload as "features": [...], e.g. ["run", "repl", "visualize", "tests", "ide", "coverage", "listtree", "tree"]. The IDE starts the tab with the same parts and ignores ide and reset.
• Without features=: the block writes nothing, and the IDE shows what it always does.
• Starting state: in the IDE, ⋮ «Optionen» can switch each part, e.g. for a teacher looking at a hand-in.
• README: a paragraph in the IDE-link section.

Checks

• New in check:ready: a block with features=run,repl,visualize,tests,ide,coverage,listtree,tree copies a link whose payload (read with zlib) has exactly that list.
• Existing case (a block without features=): now also checks that no features is written.
• check-macro passes.

Going live

• Ride along: merge this with the Etappe 4 release bump (a course patch version bump), like any macro change.
• Order: the IDE (#41, after glpython-editor#56's tag) should be live first. Before that, the old IDE ignores the unknown field, so nothing breaks, but the settings only take effect once #41 is deployed.

Manual tests

Desktop and iPad (external keyboard), after the course bump:

1. A block with features=run,repl,visualize,tests,ide,listtree,tree: «In IDE öffnen» opens the IDE with «Baum» in the visualizer and trees in the console.
2. In that tab, ⋮ → Optionen shows the block's parts switched on and the others off.
3. A block without features=: the IDE is as before.

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