Google v3 layer is displayed even if not visible

[tschaub]

If you create a map with a Google v3 layer that is not initially visible, it is still visible. Additional trouble arises with allOverlays true.

[tschaub]

make Google layer invisible

[tschaub]

This patch has two parts.

The first part adds a call to setGMapVisibility in loadMapObject (Andreas' original patch had this, but it got lost in my reworking).

The second parts moves the map object container off screen instead of setting display to none. This is a trick used elsewhere to allow for element size computation. The Google layer is incorrectly centered if display is set to none when it is not the base layer.

With this patch, the examples work and tests pass in FF 3 and IE 6. Without the lib changes, the newly added example and test demonstrate the problems.

[ahocevar]

Looks good! I totally agree with the negative offset approach. I'd only not be shy and make the offset -9999px instead of just -999px - better safe than sorry. Please commit.

[tschaub]

(In [10480]) Making it so the Google layer is not visible if used as an overlay with visibility false. Container is offset to allow proper calculation of size. r=ahocevar (closes #2730)