Fix resizing of Live views with reduced size.

[belucha]

#703

When resizing Live views e.g. tables this was working only when the size increased. This patch fixes that by detecting size decreases and forcing the IRenderable to forget it's old shape.

fixes #703

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Changes

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Please upvote 👍 this pull request if you are interested in it.

[belucha]

@microsoft-github-policy-service agree company="Intronik"

[tpill90]

@belucha I tested your changes in steam-lancache-prefill and they work as expected. Thanks for the good work!

[patriksvensson]

Merged! Thank you for your contribution. Much appreciated! 👍

[belucha]

I also tried an approach where LiveRenderable did not have PositionCursor and RestoreCursor methods, nor caching it's shape, but the LiveDisplayRenderer - Hook was using DECSC() and DECRC() Ansi sequences to store/restore the cursor positions.

But I do not know if that is available on all platforms and thought that would be a too large change, from the working solution.
Was that not considered at all - because not all terminals support that?

I admire the work done with SpectreConsole ... gives me great joy, building console applications now!

Regards