Uploading a file... to the title?

[Canapin (Coin-coin le Canapin)]

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Drag'n drop a file in the composer shouldn't start the upload if a category must be selected

When allow uncategorized topics is disabled, drag’n drop a file in the composer starts the upload without any error message though it doesn’t work. If the title field is focused (it is by default), it also fills it with the media markdown text. The expected behavior is that drag’n drop a file shouldn’t work, or trigger an error message that asks us to select a category first. Video example: Same behavior with safe-mode, I’m using Discourse 2.9.0.beta5 (e0364cf228)