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If you're using the mouse to change pencil marks, you have to right-click to pencil-highlight a square, then press a number or letter key to add or remove a highlight. That causes the highlight to vanish again. So adding or removing multiple pencil marks requires a right-click + keypress per mark. Chris's Android port reversed that decision, making the pencil highlight persist so that you could 'click' just once and then press multiple pencil keys. That makes it easier to add lots of highlights, but harder to just remove a single one (click + press + click to remove the highlight), unless you don't mind keeping the highlight around afterwards cluttering up your view. In other words, this is just the sort of thing users might reasonably disagree on. So now we have an organised preferences system, we can let them disagree, and each configure it whichever way they like! This only affects mouse-based play. The keyboard cursor has _always_ worked this way, because it doesn't disappear at all; its behaviour is unchanged, and independent of the new preference.
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/>.