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In grid-snapping mode, Untangle was still recording vertex positions in increments of one pixel. This meant that if you positioned vertices on a small window, then enlarged the window and positioned more vertices, the two sets of vertices generally wouldn't line up with one another. This was annoying, and obviously silly when Untangle has a resolution-independent co-ordinate system. So now the snapped positions are recorded in a form that doesn't depend on the tilesize.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.