RFR JDK-8171386: jshell tool: paging of javadoc output broken on Windows

[Jan Lahoda]

Hello,

The screen width and height detection is not working properly on 
Windows, because:
-a wrong handle is passed to GetConsoleScreenBufferInfo (passed is input 
handle, needs to be output handle)
-CONSOLE_SCREEN_BUFFER_INFO.dwSize.X/Y contains information about the 
size of the screen buffer, not the window - need to use 
CONSOLE_SCREEN_BUFFER_INFO.srWindow to find out the size of the window. 
(For width of the window the returned width is one character smaller 
than the actual width, as writing the very last character causes the 
cursor overflow to next line, breaking the formatting.)

Bug:
https://bugs.openjdk.java.net/browse/JDK-8171386

Webrev:
http://cr.openjdk.java.net/~jlahoda/8171386/webrev.00/

Any feedback is welcome.

Thanks,
     Jan