Using Google Maps API v3.
I noticed that if I have a map marker near the edge of my map border ... that if I click the marker icon so that the InfoWindow will displa
Since you are using v3, you can simply prevent the infoWindow from shifting the map with the disableAutoPan option, as in the following example (API Reference):
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps disableAutoPan Demo</title>
<script src="http://maps.google.com/maps/api/js?sensor=false"
type="text/javascript"></script>
</head>
<body>
<div id="map" style="width: 200px; height: 200px"></div>
<script type="text/javascript">
var myLatlng = new google.maps.LatLng(37.44, -122.14);
var myOptions = {
zoom: 4,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("map"), myOptions);
var infowindow = new google.maps.InfoWindow({
content: 'Test',
disableAutoPan: true
});
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: 'Test Marker'
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map, marker);
});
</script>
</body>
</html>
Screenshot:

There is a property called [disableAutoPan] of agm-marker-info, making it false will not shift your map InfoWindows which are located near the edge of map border.
<agm-marker-info [disableAutoPan]="false">
<b> Marker Info: "A" </b>
</agm-marker-info>