I am having trouble with horizontal lines created by typing three hyphens and then pushing enter. I always get a line, but sometimes the lines double up when I've only made one line or I can't delete them.
This feature of the auto-corrections generates a bottom border to the paragraph. If you go back to this paragraph and hit enter, then this style is used for the next paragraph too. Therefore you get a horizontal line, where you do not expect one. To get rid of the unwanted line right click into the paragraph and take item "Paragraph". In the "Border" tab of this dialog you can remove the line. Removing hard formatting with Ctrl+M would work too, but you might loose other hard formatting too. This is not a bug report but a support request.
Ayse filed this bug report to submit a patch for GSoC. But I agree that the scenario is unclear from the problem description. Three hyphen are replaced by a horizontal line (bottom border enabled on the paragraph style).
But it's not a useful feature.
(In reply to Ayyuce Demirbas from comment #0) > I am having trouble with horizontal lines created by typing three hyphens > and then pushing enter. I always get a line, but sometimes the lines double > up when I've only made one line or I can't delete them. But you should delete them with Undo (Strg+Z).