Legacy canvas: zone corner movement tricky when corner not on grid point

[Jeff Young]

Set the grid to say 0.25mm and create a new zone.
Change the grid to something larger, like 1.00mm.
Find a corner that is no longer on the grid and try to move it. It can be done, but you have to click somewhere around the corner, not directly on it.

Application: pcbnew
Version: 4.0.7 release build
wxWidgets: Version 3.0.2 (debug,UTF-8,compiler with C++ ABI 1002,GCC 4.2.1,STL containers,compatible with 2.8)
Platform: Mac OS X (Darwin 17.2.0 x86_64), 64 bit, Little endian, wxMac
Boost version: 1.57.0
Curl version: libcurl/7.54.0 LibreSSL/2.0.20 zlib/1.2.11 nghttp2/1.24.0
         USE_WX_GRAPHICS_CONTEXT=ON
         USE_WX_OVERLAY=ON
         KICAD_SCRIPTING=ON
         KICAD_SCRIPTING_MODULES=ON
         KICAD_SCRIPTING_WXPYTHON=ON
         USE_FP_LIB_TABLE=HARD_CODED_ON
         BUILD_GITHUB_PLUGIN=ON

[Jeff Young (jeyjey)]

I tried this out on the OpenGL canvas, and it works fine there, so it's a legacy-canvas-only issue (and therefore probably not worth fixing).

[Nick Østergaard (nickoe)]

Development focus is on GAL, so this is not likely to get fixed in legacy.