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only append visible svg items in modal for perf, #8 #9
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This is a first approach of how to handle a lot of svg items.
Items are absolutely positioned and only visible items are appended to the dom. Once an item become invisible it is added to a recycled_items array and reused later. With this solution there is roughly less than 50
<li>items in the<ul>, no matter how much icons are available.Without this change, opening the modal when there was 10'000 icons was making the browser nearly unresponsive (> 10 seconds), and searching was nearly impossible. With this first patch, opening, searching and scrolling feel instantaneous.