Text is overset text?

var y1 = activeDocument.activeLayer.bounds[3].value;
var h = activeDocument.activeLayer.textItem.height;

activeDocument.activeLayer.textItem.height = 2*h;

var y2 = activeDocument.activeLayer.bounds[3].value;

activeDocument.activeLayer.textItem.height = h;

alert(y2-y1)

Thanks! 

I tried to follow up on the point text work-around. 

// check if type layers in active document have overset text;
// 2021, use it at your own risk;
if (app.documents.length > 0) {
    var theCheck = checkForOversetText ();
    alert ("layers with index "+theCheck.join(", ")+" contain overset text")
};
////// check for overset texts //////
function checkForOversetText () {
    var ref = new ActionReference();
    ref.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") ); 
    var applicationDesc = executeActionGet(ref);
    var theNumber = applicationDesc.getInteger(stringIDToTypeID("numberOfLayers"));
    var theArray = new Array;
// work through layers;
    for (var m = theNumber; m >= 0; m--) {
        try {
////////////////////////////////////
var someValues = someTextProperties(m);
if (someValues != false){
if (someValues[0] == "box"){
// convert to point type;
var desc01 = new ActionDescriptor();
var ref5 = new ActionReference();
ref5.putProperty( stringIDToTypeID( "property" ), stringIDToTypeID( "char" ) );
ref5.putIndex( stringIDToTypeID( "textLayer" ), m );
desc01.putReference( stringIDToTypeID( "null" ), ref5 );
desc01.putEnumerated( stringIDToTypeID( "to" ), stringIDToTypeID( "char" ), stringIDToTypeID( "paint" ) );
executeAction( stringIDToTypeID( "set" ), desc01, DialogModes.NO );
var otherValues = someTextProperties(m);
// undo;
activeDocument.activeHistoryState = activeDocument.historyStates[activeDocument.historyStates.length - 2];
// compare;
    var theCheck = true;
    var theNumber1 = 0;
    var theNumber2 = 0;
    while (theCheck == true && theNumber1 != someValues[1].length) {
        var value1 = someValues[1][theNumber1];
        var value2 = otherValues[1][theNumber2];
        if (value1 != value2) {
            switch (value2) {
                case "\r":
                    theNumber1++;
                    theNumber2++;
                    break;
                case "-":
                    theNumber2++;
                    theNumber2++;
                    break;
                default:
                    theCheck = false;
                    break;
                };
        } else {
        theNumber1++;
        theNumber2++
        }
    };
if (theCheck == false) {theArray.push(m)}
else {};
}
};
////////////////////////////////////
    }
    catch (e) {};
    };
// select layers;
if (theArray.length > 0) {
    selectLayerByIndex(theArray[0],false);
    for (var x = 1; x < theArray.length; x++) {
    selectLayerByIndex(theArray[x],true)
    }
};
// return results;
return theArray
};
////// check something //////
function someTextProperties (theIndex) {
    try {
        var ref = new ActionReference();
        ref.putProperty(stringIDToTypeID( "property" ), stringIDToTypeID('textKey'));
        ref.putIndex ( charIDToTypeID("Lyr "), theIndex);
        var layerDesc = executeActionGet(ref);
        var textDesc = layerDesc.getObjectValue(stringIDToTypeID('textKey'));
        var theText = textDesc.getString(stringIDToTypeID('textKey'));
        var textShape = textDesc.getList(stringIDToTypeID('textShape'));
        var paragraph = typeIDToStringID(textShape.getObjectValue(0).getEnumerationValue(stringIDToTypeID('char')));
        return [paragraph, theText]
    } catch (e) {return false}
};
// by mike hale, via paul riggott;
function selectLayerByIndex(index,add){ 
    add = undefined ? add = false:add 
    var ref = new ActionReference();
        ref.putIndex(charIDToTypeID("Lyr "), index);
        var desc = new ActionDescriptor();
        desc.putReference(charIDToTypeID("null"), ref );
           if(add) desc.putEnumerated( stringIDToTypeID( "selectionModifier" ), stringIDToTypeID( "selectionModifierType" ), stringIDToTypeID( "addToSelection" ) ); 
          desc.putBoolean( charIDToTypeID( "MkVs" ), false ); 
       try{
        executeAction(charIDToTypeID("slct"), desc, DialogModes.NO );
    }catch(e){
    alert(e.message); 
    }
    };