Thanks Mike, I understand now that the z-index isn't the problem.
We can replicate this bug in FireFox 3.0.2 with a single Encoded
Polyline as follows:
<html>
<head>
<script src="http://maps.google.com/maps?
file=api&v=2&key=xxxxxxxxxx" type="text/javascript"></script>
</head>
<body>
<div id="map" style="width:600px; height: 600px;"></div>
<script type="text/javascript">
var map = new GMap2(document.getElementById("map"));
map.setCenter(new GLatLng(40,-100),3);
var control = new GLargeMapControl() ;
var topRight = new GControlPosition(G_ANCHOR_TOP_RIGHT, new
GSize(10,10));
map.addControl( control,topRight );
map.addOverlay(new GPolyline.fromEncoded({ color: "#FF0000",
weight: "5",
opacity: "1",
points: "c|lnG|vn}L_pR?",
levels: "BB",
zoomFactor: 16,
numLevels: 4}));
</script>
</body>
</html>
This map has a single Red polyline in Vermont.
by mouse clicks on the MapControl as follows, we can make the polyline
disappear
1. zoom in [+]
2. zoom in [+]
3. zoom right [>]
4. zoom right [>] polyline is still visible
5. zoom in [+]
6. zoom in [+]
7. zoom up [^]
8. zoom up [^]
9. zoom right [>]
10. zoom right [>]
11. zoom right [>]
12. zoom right [>]
13. zoom right [>] polyline is invisible
14. zoom down [v]
15. zoom out [-]
16. zoom out [-] polyline is visible again.
these 16 clicks on the map control affect the height of the SVG
polyline as follows
using FireFox FireBug DOM inspector on map.h[0].ca.height
on map load = 2405
1. 2091
2. 1480
3. 1480
4. 1480 (positive height: polyline is visible)
5. 251
6. -2228 (negative height: polyline is invisible)
7. -2228
8. -2228
9. -2228
10. -2228
11. -2228
12. -2228
13. -2228
14. -2228
15. -569
16. 265 (positive height: polyline is visible)
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