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This means that it now potentially overlaps the peg above it (part of the current guess), rather than potentially overlapping the empty hole below. More importantly, it means that the hold marker is erased by the erasure of the rest of the peg area, so there's no need to explicitly draw absent hold markers in the background colour. That in turn means that absent hold markers don't nibble the tops off all the pegs at some tile sizes. Instead of this fix, I could have properly made the hold markers part of the first row of empty holes, but that would have been rather fiddly and I've long thought that the hold markers were too far from the peg that they're holding. I've also removed part of a comment about the drawing order of hold markers that seems to have been obsolete even before this commit.
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/>.