Markdown popover
The current UI for it is a bit problematic, because it's only a single toggle button (with a pretty generic symbolic icon), which turns Markdown on or off. There isn't any further explanation as to what the button is or does, and how the feature works.
Therefore I think we should include some additional information and a make the on/off switch more obvious. We don't need a comprehensive Markdown tutorial there, just a few small things that are going to be useful to most people. We could consider adding a link to the full set of supported Markdown there, but I don't think it's necessary at the moment, because we don't support that many things yet anyway. Once we get multiline messages, this will change though, and we should revisit this.
Development Tasks
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Have the current toggle button open a popover instead -
Add an on/off switch to the popover -
Add a small Markdown tutorial -
When switch is "off", dim the tutorial text and switch the icon to "format-justify-left-symbolic"
QA Tasks
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Looks and behaves as expected
Edited by Tobias Bernard