[openstreetmap/openstreetmap-website] Provide a truncated view of recent diaries (PR #5121)

[Anton Khorev]

When I thought how to do truncated diary entries I first considered doing it server-side. I already go through markdown parse trees in the richtext library to get images and descriptions for Open Graph tags. I can probably extend that to generate truncated entries.

Then I thought that ultimately I want to limit entry heights. Isn't it easier to ask the browser what height each element is instead of trying to estimate it server-side? And if there's an image, it usually doesn't have its height specified in the source markdown code, therefore I can't know it server-side but client-side I can.

But it's not that simple. Images can load any time, including never. I'd have to listen to load events to recalculate the heights. Now it doesn't look like a good idea. Let's suppose there's a large image and some text below. Before the image is loaded that text fits in the truncated view. Am I going to remove the text after the image loads, possibly when the user is reading it? I guess it's better to estimate heights and truncate server-side.

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