Fix emoji rendering in Markdown previews #1153
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Most emojis were rendered incorrectly
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This PR fixes a bug in Markdown previews that caused wrong characters to appear in place of emojis (and other UTF-8 characters I suppose).
The culprit was the Base64-decoding function written in JS, which was apparently broken. That function has been removed and replaced with the Java implementation (which instead works as intended) through a WebView
JavascriptInterface.Here's how the bug looked like: