[PATCH app/xdpyinfo v3] Use XRANDR 1.2 extension for reporting dimensions and resolution per output

[Adam Jackson]

On Thu, 2018-04-12 at 20:47 +0200, Pali Rohár wrote:
> XServer with enabled XRANDR 1.2 extension does not provide correct
> dimensions from DisplayWidthMM() and DisplayHeightMM() calls anymore.
> Values are calculated from fixed DPI 96.
> 
> Therefore when XRANDR 1.2 extension is enabled, present and user requested
> for it, instead use XRRGetScreenResources() and XRRGetOutputInfo() calls to
> get correct dimensions and resolution information.
> 
> Otherwise when XRANDR 1.2 extension is enabled, present and user did not
> request for it (which is default), show note that printed dimension does
> not have to be correct and instruct user to run xdpyinfo with -ext RANDR.

This should print the RANDR data in a separate stanza after the main
output, like the other extensions do. Again: the purpose of the core of
xdpyinfo is to tell you what the connection block says. Don't make it
print something else.

- ajax