iconified windows have nonsensical coordinates on win32

[Antoine Martin]

Steps from a win32 client:

• maximize eclipse
• iconify it
• disconnect
• re-connect

The eclipse window ends up clamped to a tiny size in the bottom left corner because MS Windows gave us coordinates in the -32000 range.
r15044 + r15045 fix this by ignoring the map event, the window stays minimized when we re-connect.
We don't do that on other platforms because there may not be a way to de-iconify it!

Alternatively, we could detect the invalid coordinates and clamp them, or just ignore them and map at 0,0.

[Antoine Martin]

r15117 deiconifies the window when we get a map event, this makes win32 consistent with the other platforms. (and maybe this should be backported)