_GUICtrlRichEdit_SetCharBkColor()

[mLipok]

from HelpFile:

Sets the background color of selected text or, if none selected, sets the background color of text inserted at the insertion point

here is a solution to the UDF:

    If $ai[0] = $ai[1] Then
;~      Return _SendMessage($hWnd, $EM_SETCHARFORMAT, $SCF_ALL, $tCharFormat, 0, "wparam", "struct*") <> 0
        Return _SendMessage($hWnd, $EM_SETCHARFORMAT, $SCF_SELECTION, $tCharFormat, 0, "wparam", "struct*") <> 0
    Else
        Return _SendMessage($hWnd, $EM_SETCHARFORMAT, $SCF_SELECTION, $tCharFormat, 0, "wparam", "struct*") <> 0
    EndIf

And solution after cleaning, just do not use If the else statement just use:

Return _SendMessage($hWnd, $EM_SETCHARFORMAT, $SCF_SELECTION, $tCharFormat, 0, "wparam", "struct*") <> 0

MS DOC:
​http://msdn.microsoft.com/en-us/library/windows/desktop/bb774230(v=vs.85).aspx

SCF_SELECTION
Applies the formatting to the current selection. If the selection is empty, the character formatting is applied to the insertion point, and the new character format is in effect only until the insertion point changes.

Discusion:
​http://www.autoitscript.com/forum/topic/161043-clear-way-to-show-lines-in-richedit-for-code-like-scite/

[mLipok]

sorry
I forgot REPRO:

#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#include <GuiRichEdit.au3>

$Form1 = GUICreate("Form1", 615, 438, 192, 124)
GUISetState(@SW_SHOW)

Local $sText = _
        "ABCD" & @CRLF & _
        "EEEE" & @CRLF & _
        "AAAA" & @CRLF & _
        ""

$hRichEdit = _GUICtrlRichEdit_Create($Form1, "", 100, 100, 150, 150)
_Magic($hRichEdit, $sText)

While 1
    $nMsg = GUIGetMsg()
    Switch $nMsg
        Case $GUI_EVENT_CLOSE
            Exit

    EndSwitch
WEnd

Func _Magic(ByRef $hRichEdit, $sText)
    Local $aTextTemp = StringSplit($sText, @CRLF, 1)

    For $i = 1 To $aTextTemp[0]
        _GUICtrlRichEdit_SetSel($hRichEdit,-1,-1)
        Sleep(100) ; this can be removed
        _GUICtrlRichEdit_SetCharBkColor($hRichEdit, Dec("00FF00"))
        Sleep(100); this can be removed
        _GUICtrlRichEdit_InsertText($hRichEdit, $i)
        Sleep(100); this can be removed
        _GUICtrlRichEdit_SetSel($hRichEdit,-1,-1)
        Sleep(100); this can be removed
        _GUICtrlRichEdit_SetCharBkColor($hRichEdit, Dec("FFFFFF"))
        Sleep(100); this can be removed
        _GUICtrlRichEdit_InsertText($hRichEdit, " " & $aTextTemp[$i] & @CRLF)
        Sleep(100); this can be removed
    Next
EndFunc   ;==>_Magic

[Jpm]

Fixed by revision [10091] in version: 3.3.11.5