[cedricvogel-leo]

P53b, the macro half. Merge after glpython-edu/glpython-editor#61, which deploys the embed that fills its iframe and reports its natural height. With today's embed, this macro would cut off a tall visualizer instead of scrolling it.

Change

• fitHeight sets the iframe to min(the content's height from glpython:resize, 80 % of the visible height − the block's own rows).
• The visible height is the clientHeight of the element that scrolls the course: the nearest ancestor with overflow-y: auto|scroll, which is .lia-slide__container in LiaScript; otherwise the window.
• The block's own rows are the buttons, libraries and notes above the iframe. If an opened row (a library's file, the IDE link) would leave the iframe less than 50 % of the visible height, the iframe keeps 50 %.
• It is recalculated on every glpython:resize, on window resize, and through a ResizeObserver on the scrolling element and the block. That covers fullscreen, rotation, presentation mode, and LiaScript's top bar shown or hidden.
• The fixed 1200 px is gone, and so are windowHeight / visualizerHeight in the URL.
• large: while visualizing, the embed gets the full 80 %; otherwise it keeps its natural height. The embed now says whether it visualizes (visualizing in glpython:resize); with an older embed, only visual blocks count as visualizing.
• A visual block still starts at its minimum (190 px; large: the maximum), and no minimum exceeds the maximum.
• README: the author-facing text on heights and large.

Checks

• check-macro and check:ready pass. New cases in check:ready, with a stand-in scrolling container:
  • the block is 80 % of 600 px;
  • a short content keeps its own height;
  • when the container grows to 900 px, the block becomes 80 % of that;
  • large gets its own height until it visualizes, then 80 %.
• Real LiaScript player with the local embed of #61: the details are in that PR. In short, the block is 80 % of the visible height in textbook and presentation mode, with the top bar hidden and shown, at window heights 600/900/1100 and at 768×1024 with touch. Short programs keep the old heights.

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