Use AutoHotkey to remove unwanted characters like line breaks from the clipboard when copying text from a PDF with ctrl+c (tested with Adobe Acrobat and SumatraPDF)

fixPDFtextCopyPaste.ahk

#NoEnv  ; Recommended for performance and compatibility with future AutoHotkey releases.
; #Warn  ; Enable warnings to assist with detecting common errors.
SendMode Input  ; Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir%  ; Ensures a consistent starting directory.

#IfWinActive ahk_class SUMATRA_PDF_FRAME
^c:: 
    old := ClipboardAll
    clipboard := ""
    send ^c
    clipwait 0.1
    if clipboard = 
        clipboard := old
    else {
        tmp := RegExReplace(clipboard, "(\S.*?)\R(.*?\S)", "$1 $2")
        clipboard := tmp
        StringReplace clipboard, clipboard, % "  ", % " ", A
        clipwait 0.1
        }
    old := ""
    tmp := ""
return

#IfWinActive ahk_class AcrobatSDIWindow 
^c:: 
    old := ClipboardAll
    clipboard := ""
    send ^c
    clipwait 0.1
    if clipboard = 
        clipboard := old
    else {
        tmp := RegExReplace(clipboard, "(\S.*?)\R(.*?\S)", "$1 $2")
        clipboard := tmp
        StringReplace clipboard, clipboard, % "  ", % " ", A
        clipwait 0.1
        }
    old := ""
    tmp := ""
return