Remove line breaks

Joins every line into one paragraph, dropping blank lines and trimming each line first. It is the standard fix for text copied out of a PDF, where every visual line arrives as a separate line break.

A PDF has no concept of a paragraph — it positions text on a page, so a copy operation reconstructs line breaks from where the lines happened to fall. Paste that into anything with its own line wrapping and you get a ragged mess that reflows badly. Joining the lines back together restores the paragraph. Two things worth watching: hyphenated words split across lines join as "hyphen-ated" and need a manual fix, and genuine paragraph breaks are lost along with the accidental ones, so it is worth splitting the text into paragraphs first and joining each separately if the structure matters.