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midend_process_key() has some generic code for converting MOD_CTRL along with a printing character into a control character. This is derived from the Emscripten front-end because browsers don't do this themselves. Most other front ends seem to depend on the platform for this mapping. The mapping was applied to all printable ASCII characters, but this meant that Ctrl+-, which is commonly used by browsers to mean "zoom out" got converted into CR and then CURSOR_SELECT. That was confusing to say the least. So now, the CTRL mapping is only applied to characters in the roughly alphabetic range (0x40 to 0x7f), and MOD_CTRL applied to a character in the range 0x20 to 0x3f gets a return of PKR_UNUSED instead. That means that Ctrl+- in browsers now works properly. I don't think this will affect other front-ends because they're generally a lot less generous about passing MOD_CTRL to the mid-end. I've tested the GTK port nonetheless and not found any problems.
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/>.