Determine if onEdit() was triggered by inserting or removing a row

• I have two spreadsheets, SS1 and SS2.
• I need to update SS2 when a row is inserted into or removed from SS1, or when a certain range of cells is changed in SS1.
• I use an installed onChange() trigger to call a function to determine when a row is inserted or removed from SS1 as follows:

function changeHappened(e){  if (e.changeType == "INSERT_ROW" || e.changeType == "REMOVE_ROW")  {    // do an autoresize in SS2  }}

• This works perfectly.
• I also need to do the autoresize in SS2 when a cell is changed within a certain range in SS1. I can't use onChange() for that because row and column information isn't available via onChange(), so I use an installed onEdit() trigger to call a function to determine if the change happened in the range I'm interested in and if so, to do the autoresize in SS2.
• The problem is, inserting and removing rows not only fires onChange(), it also fires onEdit(). I need a way to determine in the function called by onEdit() if what happened was a row being added or removed because I don't want to update SS2 twice. I have tried many things, but haven't found a reliable test.

QUESTION: Can someone suggest a reliable test in an onEdit() called function to tell if the trigger happened due to inserting or removing a row?

I have tried checking the sheet, row, and column available in the onEdit() function, but they seem to come back with random values when a row is inserted or deleted. When I delete rows, sometimes the current sheet is even reported as another sheet in the spreadsheet file.