Another option might be copying the Layer Style, removing it, merging and then applying the Layer Style again.
// mergeGroupButMaintainLayerStyle
// 2024, use it at your own risk;
if (app.documents.length > 0) {
var myDocument = app.activeDocument;
var selectedLayers = collectSelectedLayersBounds();
if (selectedLayers.length == 1 && activeDocument.activeLayer.typename == "LayerSet") {
// =======================================================
executeAction( stringIDToTypeID( "copyEffects" ), undefined, DialogModes.NO );
// =======================================================
var desc5 = new ActionDescriptor();
var ref1 = new ActionReference();
ref1.putEnumerated( stringIDToTypeID( "layer" ), stringIDToTypeID( "ordinal" ), stringIDToTypeID( "targetEnum" ) );
desc5.putReference( stringIDToTypeID( "null" ), ref1 );
executeAction( stringIDToTypeID( "disableLayerStyle" ), desc5, DialogModes.NO );
// =======================================================
executeAction( stringIDToTypeID( "mergeLayersNew" ), undefined, DialogModes.NO );
// =======================================================
var desc13 = new ActionDescriptor();
desc13.putBoolean( stringIDToTypeID( "allowPasteFXOnLayerSet" ), true );
executeAction( stringIDToTypeID( "pasteEffects" ), desc13, DialogModes.NO );
}
};
////// collect bounds of selected layers //////
function collectSelectedLayersBounds () {
// set to pixels;
var originalRulerUnits = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;
// get selected layers;
var selectedLayers = new Array;
var ref = new ActionReference();
ref.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
var desc = executeActionGet(ref);
if (desc.getBoolean(stringIDToTypeID("hasBackgroundLayer")) == true) {var theAdd =0}
else {var theAdd = 1};
if( desc.hasKey( stringIDToTypeID( 'targetLayers' ) ) ){
desc = desc.getList( stringIDToTypeID( 'targetLayers' ));
var c = desc.count;
var selectedLayers = new Array();
// run through selected layers;
for(var i=0;i<c;i++){
var theIndex = desc.getReference( i ).getIndex()+theAdd;
// get id for solid color layers;
try {
var ref = new ActionReference();
ref.putIndex( charIDToTypeID("Lyr "), theIndex );
var layerDesc = executeActionGet(ref);
var theName = layerDesc.getString(stringIDToTypeID('name'));
var theIdentifier = layerDesc.getInteger(stringIDToTypeID ("layerID"));
var theBounds = layerDesc.getObjectValue(stringIDToTypeID("bounds"));
var theseBounds = [theBounds.getUnitDoubleValue(stringIDToTypeID("left")), theBounds.getUnitDoubleValue(stringIDToTypeID("top")), theBounds.getUnitDoubleValue(stringIDToTypeID("right")), theBounds.getUnitDoubleValue(stringIDToTypeID("bottom"))];
selectedLayers.push([theName, theIdentifier, theseBounds]);
} catch (e) {};
};
// if only one:
}else{
var ref = new ActionReference();
ref.putEnumerated( charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
var layerDesc = executeActionGet(ref);
try {
var theName = layerDesc.getString(stringIDToTypeID('name'));
var theIdentifier = layerDesc.getInteger(stringIDToTypeID ("layerID"));
var theBounds = layerDesc.getObjectValue(stringIDToTypeID("bounds"));
var theseBounds = [theBounds.getUnitDoubleValue(stringIDToTypeID("left")), theBounds.getUnitDoubleValue(stringIDToTypeID("top")), theBounds.getUnitDoubleValue(stringIDToTypeID("right")), theBounds.getUnitDoubleValue(stringIDToTypeID("bottom"))];
selectedLayers = [[theName, theIdentifier, theseBounds]]
} catch (e) {};
};
// reset;
app.preferences.rulerUnits = originalRulerUnits;
return selectedLayers;
};
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