I like the way @erlend_sh is thinking here… Another couple ideas to explore:
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Use the full screen for the composer on mobile
There isn’t really enough room to navigate when it’s up anyway. People can collapse it if they want to explore while they are drafting a topic. -
Make the category selector and/or topic entry separate modals.
They could take less space in the composer of they were just links that opened a modal to enter them this way (kind of like the upload button).
I also like the idea of just hiding the toolbar on mobile… maybe an argument could be made to add a link to insert emoji could be placed next to the upload link?