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Mobile definitely needs undo/redo at some point, but this is indeed missing.
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Your issue here is that $ is reserved for math expressions. You can check the markdown guide for more information. If you won’t ever use math in your markdown you can disable the math plugin under Tools -> Options -> Plugins.
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No save button, it will autosave
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This looks like a font issue? I don’t think I’ve ever seen this reported before but I suspect you are missing a required font, but I don’t know why the font wouldn’t be bundled.
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If you hit enter with the search box open it will find and scroll to the next match. Is that what you’re missing? I don’t really understand the problem. Also there are 2 arrows in the search box for find next and find previous
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I’m sorry I don’t understand this. Joplin has a search bar at the top for searching through notes.
And there is an ongoing project for improving the search.