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The two Return/Enter keys have always been treated the same in the past, but a user complained today that Enter was no longer functioning as CURSOR_SELECT in the web puzzles. This happened in commit 9dbcfa765ba59a8, apparently because the web front end is now translating the Enter key as MOD_NUM_KEYPAD | '\r' instead of just '\r', and the new code in midend.c is only stripping off MOD_NUM_KEYPAD for values >= 0x80. Now it strips MOD_NUM_KEYPAD off C0 control characters as well, so that only _printable_ ASCII characters can still have that modifier when they get to the backend - i.e. you can tell numpad digits from normal digits, and ditto +-* etc. But keypad Enter is now turned into plain '\r' by the modifier removal code, and then into CURSOR_SELECT. Other front ends still aren't even bothering to set MOD_NUM_KEYPAD on the code sent by Enter. But that's fine, because now midend.c officially doesn't care whether they do or not.
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/>.