Wow the composer has come a long way. 
I noticed a few small things using it to write a longer report just now, with alot of copying and pasting and fiddling with content:
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if you paste in a link on its own line, then follow it with some text, it will remain oneboxed. there seems to be no way to remove the onebox and have the link just show as though it were later in the line, after some words. workaround seems to be to type the following text first then go back to the beginning of the line to paste in the link.
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selecting some text and then choosing “Hide details” from the menu causes your text to be overwritten. In the markdown composer it just makes the selected text hidden. (See screencasts below)
- I will test it again here but in another topic I used hidden details and while the toggle works it is expanded and showing the hidden text by default. You want it to be hidden by default.
Summary
I want to hide this text