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.
Follow-up to #5303. When deduplication shortens a thread ([[a, b], [b, c]] -> [[a, b], [c]]) and no frame changed, the fast path dropped [c] without clearing its threaded continuation. A thread that lost a listing now counts as changed and is flowed again.
Reflow copied each listed frame's text into its thread's story, so a
document that listed one frame several times in a thread, or in several
threads, repeated that text in the story and wrote the grown story back
for the next thread to copy again, growing the text with every
repetition while the document opened. Reflow now keeps each frame at its
first place in the thread list only.
text.setFormat {antiAlias} and the Character panel set the method of the
targeted type objects only. Threading frames, reflowing a thread and
opening a file no longer give every frame of a thread the first frame's
method.