There have been some changes to the way the "Apply Format" feature works on 2.8. The main change is that the Apply Format function is "Markdown compatible". In particular it will now consider that a line that ends with a period marks the end of a paragraph. It will also consider that a line beginning with any of the markdown list markers (i.e. "-", "+" or "*") marks the beginning of a paragraph.
That being said, there is a small bug in which Apply Format will do nothing when a paragraph spans a single line.
Also, please note that Ctrl+E is not (and never was) the same as using the "Apply Format" context menu. Ctrl+E runs Apply Format on the paragraph where the cursor is, not on the whole text.
messageentry: fix Apply Format when paragraph has a single line (closes #2597)
We were not formatting any single line paragraphs, when only the first (subject)
paragraph should not be formatted.
If the first (subject) paragraph has a single line it is not formatted to ensure
that commit subjects have a single line by default. The user can still force
the formatting of the first line by manually making the first paragraph span
more than one line, in which case we apply the format to that first paragraph