Text-frame word wrap
There should be a command, perhaps in the text toolbar, that word-wrap-fills text in an open text or horizontal frame. This is not the same as justify (see #292362: Justify text feature ). This would not be a mode or frame attribute, but a one-shot command. The effect would be to insert "soft" line breaks before, and only before, words that overflow the right margin, and preserve "hard" (user-entered "Return") line breaks. As in all such implementations, words longer than the width of the box would stay unaltered.
Manual text-filling of text in text frames, required now when frames are resized, is difficult and extremely time-consuming. How to define this usefully for text-boxes, which expand to fit what you type, is an issue.