pcbnew GAL: reset local coordinates not snapped to grid

Space does actually work, but when drawing, it takes the exact mouse pointer position, not the snapped-to-grid cursor (the white cross) position. This makes it basically impossible to get an accurate reading for drawing actions on the grid (unless you can do the rounding in your head, and your mouse pointer was close enough to the cursor at the time!).

There needs to be 2 modes in which dx/dy work:
1. snap to grid
2. freehand

The reason for freehand is because if you're not on a grid, like rounded corners, and you need to make sure the narrowest point is at least X, you use the mouse to check, and it won't be precise enough if it's snapping to large grid points instead.

I've found that while editing footprints in Cairo, software would start behaving oddly, stop snapping to grid, or stop performing freehand, and also stop updating dx/dy values no matter where the mouse is moved although spacebar would update the dx/dy but no updates on mouse movement. I've also had bugs where select/delete would not work on a simple line, and I had to restart Footprint editor for the aforementioned problems to go away.

I can also confirm this bug - it appears that when you press Space to "reset" the local origin, it takes the origin point for delta-measurement (dx/dy) not from the closest grid point but from the exact mouse pos (as John notes, above).

This *used to work as intended* however at some recent stage the behaviour has changed. Any chance this could be addressed (just this measurement bug, not the "dual modes" as suggest above) soon, rather than waiting for 5.0.0?

Fixed in revision 481fd233d49f640ed38ee252b7810cc25a58c96c
https://git.launchpad.net/kicad/patch/?id=481fd233d49f640ed38ee252b7810cc25a58c96c