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This applies to various square-filling games: Keen, Solo, Towers, Undead, and Unequal. In all cases, selecting a square and pressing the number that was already in it, or selecting an empty square and pressing Backspace, would add a move to the undo chain that did nothing. This also meant that the convention where Backspace from the top level of an application in KaiOS leaves the application didn't work. Now the various interpret_move() functions check the current state of the grid, and return NULL or UI_UPDATE where a move wouldn't change the board. UI_UPDATE is returned in the case where the cursor was put in place using the mouse, because in those cases I think the cursor should still be hidden again. NULL is returned when the cursor was put in place by keyboard, because then there's really nothing to do.
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/>.