The bug seems to be in Windows when it upscales an smaller icon for
HiDPI displays. It works fine if we provide a 256x256 size in the
ico files.
Use the new square icons also used on OS X that removes the share badge
and instead has a share icon only for the OK state. This means that we
can also remove 3 icons and release 3 slots in the registry for
overlay icons (only the first few are actually loaded by explorer).
This also adds a script that uses ImageMagick to convert our SVG icons
to Windows ico files. Since ImageMagick seems to have issue doing
proper antialiasing with pixels on the edge of icons, this also
slightly scale the icons to leave 2px on each edge, out of its
logical 128px width.
There is a race condition that can initialize the RemotePathChecker
instance concurrently on the same address and cause a crash when locking
the mutex. The reason is that local static initialization is not
thread-safe with MSVC2013.
Fix the issue by using call_once to initialize a static unique_ptr
instead.
This could be related to some reports of issue #2836.
It seems like verclsid.exe hangs on our class IDs when invoked
through explorer.exe for 5-10 seconds. It doesn't hang if I
invoke the same command line from cmd.exe, so there could be some
process parameters that don't play well with our extra thread
or to the pipe connection that we do in it.
Delay creating the RemotePathChecker thread until the first
IsMemberOf call. verclsid.exe only seems to instantiate a object
of each registered class, without actually using them, so we
can use this as a workaround.
This should be fixing issue #2680.
