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I just introduced the 'first_draw' flag in the midend, which should force a screen clear whenever we draw a puzzle with a fresh drawstate. But in fact there were several places where the midend replaces the drawstate and I hadn't set that flag to true. In particular, a user just reported that when you press 'n' for a new game in an existing Magnets window, the new puzzle's clues are drawn, but any old clues in places where the new puzzle doesn't have one is not _un_drawn. (Because Magnets has no code to undraw a single clue - it never needs to!) Added a set of first_draw wherever we call new_drawstate, which should make this reliable again.
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/>.