<<ma requête>>
Ci-contre les cas d'usage et comportements attendus du code VBA ci-dessous :
1. `X` non vide et `Y` non vide et `where` non vide : incrémente les données par le haut (`where` = "top") ou le bas (`where` = "bottom")
2. `X` non vide et `Y` vide et `where` non vide : incrémente les données par le haut (`where` = "top") ou le bas (`where` = "bottom")
3. `X` vide et `Y` non vide et `where` non vide : alerter l'utilisateur que `X` est vide et que rien ne sera incrémenté
4. `X` vide et `Y` vide et `where` non vide : alerter l'utilisateur que `X` est vide et que rien ne sera incrémenté
5. `X` non vide et `Y` non vide et `where` vide : incrémente les données par le bas (`where` = "bottom")
6. `X` non vide et `Y` vide et `where` vide : incrémente les données par le bas (`where` = "bottom")
7. `X` vide et `Y` non vide et `where` vide : alerter l'utilisateur que `X` est vide et que rien ne sera incrémenté
8. `X` vide et `Y` vide et `where` vide : alerter l'utilisateur que `X` est vide et que rien ne sera incrémenté

Le code VBA ci-dessous fonctionne parfaitement à une exception près.
J'ai le message d'erreur `An unexpected error occured. Error 5: Argument ou appel de procédure incorrect` lorsque le tableau source contient uniquement une ligne vide

Nota bene :
- il peut arriver que les tableaux soient totalement vides ; autrement dit, que l'intégralité de leurs lignes (>0) soient vides.
- il peut arriver que l'ordre des colonnes de chacun des tableaux ne coïncident pas. Le cas échéant, il faut prévenir l'utilisateur puis les données doivent être collées dans les bonnes colonnes.
- il peut arriver que le tableau source comporte une ou plusieurs colonnes supplémentaires par rapport au tableau destinataire. Le cas échéant, il faut prévenir l'utilisateur et demander s'il faut ajouter ou non la nouvelle colonne dans le tableau de destination.
- il peut arriver que les tableaux diffèrent de par le nombre de colonnes ou les noms de colonnes voire les deux. Le cas échéant, il faut prévenir l'utilisateur.
- veile à ce que le code n'ajoute pas autant de lignes `#N/A` qu'il y a de lignes dans le tableau source.

Exemples d'utilisation de la macro
```
<<exemple 01>>
    Set X = Workbooks("Classeur2.xlsx").Sheets("Feuil1").Range("Tableau1")
    Set Y = Workbooks("Classeur3.xlsx").Sheets("Feuil1").Range("Tableau2")
    Call incrementX2Y(X, Y, "top")
    Call incrementX2Y(Workbooks("Classeur2.xlsx").Sheets("Feuil1").Range("Tableau1"), Workbooks("Classeur3.xlsx").Sheets("Feuil1").Range("Tableau2"), "top")
<</exemple 01>>
<<exemple 02>>
    Set X = Range("Tableau11")
    Set Y = Range("Tableau22")
    Call incrementX2Y(X, Y, "bottom")
    Call incrementX2Y(Range("Tableau11"), Range("Tableau22"), "top")
<</exemple 02>>
```

Optimise et Corrige le code en conséquence.
Vérifie impérativement et scrupuleusement que le code fonctionne parfaitement et totalement tel que demandé au moins 25 cycles de tests unitaires.
Une fois le code corrigé et optimisé, commente le code.
Je veux uniquement le code corrigé, optimisé et commenté (entièrement en anglais).
Si ma requête comporte des incohérence ou impossibilité techniques, signale les moi explicitement.
<</ma requête>>

<<mon code VBA>>
' ------------------------------------------------------------------
' Procedure name            : increment_tables
' Version                   : 1.5.0
' Procedure purpose         : Copies data from a source ListObject to a destination ListObject.
'                             - Handles empty or blank source/destination tables robustly.
'                             - Manages mismatched column orders by mapping headers.
'                             - Prompts to add extra columns from source to destination.
'                             - Alerts if destination has columns not present in source.
'                             - Supports adding data to the "top" or "bottom".
' File(s)/Sheet(s) linked   : None. Works on any two specified ListObject ranges.
' Created                   : 2025-07-17 by Gemini Pro
' Modified                  : 2025-07-17 by Gemini Pro - Corrected Error 5 for single-cell source tables (1x1).
' Comment(s)                : - This procedure requires that the source and destination ranges
'                               are part of formally defined Excel Tables (ListObjects).
'                             - It assumes table headers are unique. Duplicates will be ignored.
'                             - Optimized for speed by using variant arrays for data manipulation.
' Useful URL(s)             : none
' ------------------------------------------------------------------
Sub increment_tables_09(ByVal srcRange As Range, ByVal dstRange As Range, Optional ByVal insertPosition As String = "bottom")

    ' =========================================================================================
    '   1. SETUP
    '   Declare variables and set up the environment for optimal performance.
    ' =========================================================================================

    ' --- Objects
    Dim srcTbl As ListObject, dstTbl As ListObject
    Dim srcHeaderMap As Object, dstHeaderMap As Object

    ' --- Data Arrays
    Dim srcData As Variant, transferData As Variant
    
    ' --- Counters & Indices
    Dim rowsToAdd As Long, dstInitialDataRows As Long, i As Long
    Dim srcColIdx As Long, dstColIdx As Long

    ' --- User Interaction & Column Analysis
    Dim extraSrcCols As Object, missingFromSrcCols As Object
    Dim msg As String, response As VbMsgBoxResult
    
    ' --- Miscellaneous
    Dim key As Variant
    
    ' --- Performance Optimization
    Application.ScreenUpdating = False
    Application.EnableEvents = False
    Application.Calculation = xlCalculationManual

    On Error GoTo CleanUpAndExit

    ' =========================================================================================
    '   2. VALIDATE_INPUTS
    '   Ensure that inputs are valid and that there is actual data to process.
    ' =========================================================================================

    On Error Resume Next
    Set srcTbl = srcRange.ListObject
    Set dstTbl = dstRange.ListObject
    On Error GoTo CleanUpAndExit

    If srcTbl Is Nothing Or dstTbl Is Nothing Then
        MsgBox "Error: Source and/or destination range is not inside a valid Excel Table.", vbCritical
        GoTo CleanUpAndExit
    End If
    
    If srcTbl.DataBodyRange Is Nothing Or Application.WorksheetFunction.CountA(srcTbl.DataBodyRange) = 0 Then
        MsgBox "The source table is empty or contains only blank cells. No data will be copied.", vbInformation, "Operation Skipped"
        GoTo CleanUpAndExit
    End If

    ' =========================================================================================
    '   3. MAP_COLUMNS
    '   Create dictionaries to map header names to column indices for both tables.
    ' =========================================================================================
    
    Set srcHeaderMap = CreateObject("Scripting.Dictionary")
    srcHeaderMap.CompareMode = vbTextCompare
    For i = 1 To srcTbl.HeaderRowRange.Columns.Count
        srcHeaderMap(CStr(srcTbl.HeaderRowRange.Cells(1, i).Value)) = i
    Next i

    Set dstHeaderMap = CreateObject("Scripting.Dictionary")
    dstHeaderMap.CompareMode = vbTextCompare
    For i = 1 To dstTbl.HeaderRowRange.Columns.Count
        dstHeaderMap(CStr(dstTbl.HeaderRowRange.Cells(1, i).Value)) = i
    Next i

    ' =========================================================================================
    '   4. ANALYZE_AND_ADJUST_COLUMNS
    '   Check for column differences and interact with the user accordingly.
    ' =========================================================================================
    
    Set extraSrcCols = CreateObject("System.Collections.ArrayList")
    For Each key In srcHeaderMap.Keys
        If Not dstHeaderMap.Exists(key) Then extraSrcCols.Add key
    Next key
    
    If extraSrcCols.Count > 0 Then
        msg = "The source table contains " & extraSrcCols.Count & " extra column(s):" & vbCrLf & vbCrLf
        For i = 0 To extraSrcCols.Count - 1: msg = msg & "- " & extraSrcCols(i) & vbCrLf: Next i
        msg = msg & vbCrLf & "Do you want to add these columns to the destination table?"
        response = MsgBox(msg, vbYesNo + vbQuestion, "Add New Columns?")
        If response = vbYes Then
            For i = 0 To extraSrcCols.Count - 1: dstTbl.ListColumns.Add.Name = extraSrcCols(i): Next i
            dstHeaderMap.RemoveAll
            For i = 1 To dstTbl.HeaderRowRange.Columns.Count
                dstHeaderMap(CStr(dstTbl.HeaderRowRange.Cells(1, i).Value)) = i
            Next i
        End If
    End If

    Set missingFromSrcCols = CreateObject("System.Collections.ArrayList")
    For Each key In dstHeaderMap.Keys
        If Not srcHeaderMap.Exists(key) Then missingFromSrcCols.Add key
    Next key
    
    If missingFromSrcCols.Count > 0 Then
        msg = "The following " & missingFromSrcCols.Count & " destination column(s) will not be populated as they do not exist in the source table:" & vbCrLf & vbCrLf
        For i = 0 To missingFromSrcCols.Count - 1: msg = msg & "- " & missingFromSrcCols(i) & vbCrLf: Next i
        msg = msg & vbCrLf & "The process will continue, leaving these columns blank."
        MsgBox msg, vbInformation, "Missing Source Columns"
    End If

    ' =========================================================================================
    '   5. PREPARE_DATA_TRANSFER
    '   Load source data and normalize it into a 2D array before preparing the transfer.
    ' =========================================================================================

    ' --- 5a. LOAD_SOURCE_DATA
    srcData = srcTbl.DataBodyRange.Value2

    ' --- 5b. NORMALIZE_SOURCE_DATA_ARRAY
    '       This block handles the VBA quirk where .Value2 returns different data types
    '       based on the source range size, ensuring srcData is ALWAYS a 2D array.
    If Not IsArray(srcData) Then
        ' CASE 1: Source is a single cell (1x1). .Value2 returns a scalar value, not an array.
        ' We must manually build a 1x1 2D array.
        Dim singleCellArray As Variant
        ReDim singleCellArray(1 To 1, 1 To 1)
        singleCellArray(1, 1) = srcData
        srcData = singleCellArray
        
    ElseIf UBound(srcData, 1) = srcTbl.HeaderRowRange.Columns.Count And srcTbl.DataBodyRange.Rows.Count = 1 Then
        ' CASE 2: Source is one row with multiple columns. .Value2 returns a 1D array.
        ' We must convert it to a 2D array (1 row, N columns).
        Dim oneRowArray As Variant
        ReDim oneRowArray(1 To 1, 1 To UBound(srcData))
        For i = 1 To UBound(srcData)
            oneRowArray(1, i) = srcData(i)
        Next i
        srcData = oneRowArray
    End If
    ' CASE 3: Source is multiple rows. .Value2 correctly returns a 2D array. No action needed.

    ' --- 5c. PREPARE_TRANSFER_ARRAY
    rowsToAdd = UBound(srcData, 1)
    ReDim transferData(1 To rowsToAdd, 1 To dstTbl.ListColumns.Count)

    For Each key In srcHeaderMap.Keys
        If dstHeaderMap.Exists(key) Then
            srcColIdx = srcHeaderMap(key)
            dstColIdx = dstHeaderMap(key)
            For i = 1 To rowsToAdd
                transferData(i, dstColIdx) = srcData(i, srcColIdx)
            Next i
        End If
    Next key

    ' =========================================================================================
    '   6. PASTE_DATA
    '   Insert the prepared data into the destination table, avoiding resize errors.
    ' =========================================================================================

    If dstTbl.DataBodyRange Is Nothing Then
        dstInitialDataRows = 0
    Else
        dstInitialDataRows = dstTbl.DataBodyRange.Rows.Count
    End If
    
    Select Case LCase(Trim(insertPosition))
        Case "top"
            dstTbl.HeaderRowRange.Offset(1).Resize(rowsToAdd).Insert Shift:=xlDown
            dstTbl.DataBodyRange.Rows(1).Resize(rowsToAdd, dstTbl.ListColumns.Count).Value2 = transferData

        Case Else ' Default behavior is "bottom"
            Dim pasteRange As Range
            Set pasteRange = dstTbl.HeaderRowRange.Offset(dstInitialDataRows + 1).Resize(rowsToAdd, dstTbl.ListColumns.Count)
            pasteRange.Value2 = transferData
            dstTbl.Resize dstTbl.HeaderRowRange.Resize(dstInitialDataRows + rowsToAdd + 1, dstTbl.ListColumns.Count)
    End Select

CleanUpAndExit:
    ' =========================================================================================
    '   7. CLEANUP
    '   Restore application settings and release object variables.
    ' =========================================================================================
    If Err.Number <> 0 Then
        MsgBox "An unexpected error occurred." & vbCrLf & "Error " & Err.Number & ": " & Err.Description, vbCritical
        On Error GoTo 0
    End If

    Application.Calculation = xlCalculationAutomatic
    Application.EnableEvents = True
    Application.ScreenUpdating = True
    
    Set srcTbl = Nothing: Set dstTbl = Nothing
    Set srcHeaderMap = Nothing: Set dstHeaderMap = Nothing
    Set extraSrcCols = Nothing: Set missingFromSrcCols = Nothing

End Sub
<</mon code VBA>>

<<une piste potentiellement à explorer>>
Private Function IsTableBodyEffectivelyBlank(tbl As ListObject) As Boolean
    ' ------------------------------------------------------------------
    '   This is a helper function to provide a 100% reliable check
    '   to see if a table's body is visually empty for a user.
    '   It returns TRUE if the body doesn't exist, or if every cell
    '   in the body is empty or contains a formula returning "".
    ' ------------------------------------------------------------------
    Dim body As Range
    
    On Error Resume Next
    Set body = tbl.DataBodyRange
    On Error GoTo 0

    ' --- Case 1: The table has no data rows at all. The table is blank.
    If body Is Nothing Then
        IsTableBodyEffectivelyBlank = True
        Exit Function
    End If

    ' --- Case 2: Definitive check. Loop through each cell.
    ' --- This is required to handle cells that contain formulas
    ' --- which return an empty string (e.g., =IF(A1>5, "OK", "")).
    ' --- CountA would count this as data, but visually it is blank.
    Dim cell As Range
    For Each cell In body.Cells
        ' --- Check if the cell's value, converted to a string and trimmed of spaces, has any length.
        If Len(Trim(CStr(cell.Value))) > 0 Then
            ' --- Found a cell with actual data. The table is NOT blank.
            IsTableBodyEffectivelyBlank = False
            Exit Function
        End If
    Next cell
    
    ' --- If the loop completes, it means every cell was checked and found to be effectively blank.
    IsTableBodyEffectivelyBlank = True
End Function
<</une piste potentiellement à explorer>>