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InputBox autocomplete-as-you-type

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I'm trying to have an InputBox in my GUI that will automatically complete specific words as you type them, similar to how Chrome will autocomplete the web address you're typing as you type it. The part I can't quite figure out is how to allow the user to continue typing through the autofilled text, changing on the fly if necessary.

Here's my starter script:

#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#include <GuiEdit.au3>
#Region ### START Koda GUI section ### Form=
$Form2 = GUICreate("Form2", 405, 294, 302, 218)
$Input1 = GUICtrlCreateInput("Input1", 140, 110, 121, 21)
#EndRegion ### END Koda GUI section ###

$oldinput = ""

$match = StringSplit("Firstmatch,secondmatch",",")

While 1
    $nMsg = GUIGetMsg()
    Switch $nMsg
        Case $GUI_EVENT_CLOSE
    $newinput = GUICtrlRead($input1)
    If $newinput <> $oldinput and $newinput <> "" Then
        For $i = 1 to $match[0]
            If StringLeft($match[$i],StringLen($newinput)) = $newinput Then
        $oldinput = GUICtrlRead($input1)

As you type, if the text in the box matches any of the text entries in $match ("firstmatch" or "secondmatch",) it will fill the rest of the text. I've managed to successfully set the text highlight and cursor so that you can continue typing, changing if necessary. The only obstacle right now is that if the text is autofilled to completion, Backspace doesn't work. It immediately autofills the text again.

I could probably make a workaround by looking for the actual backspace button press and emulating the feature, but I'd like to see if there is a more native or elegant solution.

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