A paragraph format given to the empty paragraph after a frame's last
paragraph break was lost when the story flowed again: the paragraph is
shared with the next frame's first paragraph, and the next frame's old
style replaced it, in that frame and in the frames after it.
- The thread reflow also notes which frames' last paragraph changed
style, and story_paras_restyled keeps that style against the next
frame's unedited first paragraph, across unedited empty frames too.
When the same edit formats the next frame's first paragraph, that
format applies, as before.
- story_paras keeps its behavior for its other callers.
- Tests cover area type and type on a path on either side, a next frame
holding text, three frames, undo and redo, a format that changes
nothing, and numbered list counts.
When a frame's text ends with a paragraph break and the next frame is empty, restyling that empty frame was undone on reflow: an unedited empty frame after it gave the story's last paragraph its own style again. A restyled empty frame now keeps its style against unedited empty frames that follow it. Unedited empty frames before it, later frames with text and later restyled frames still give the paragraph their style, as before.
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