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Now using the browser's "copy" operation while the focus is in the puzzle will copy the puzzle state to the clipboard. Browsers seem to have odd ideas about whate element to target with the "copy" event: Firefox targets the parent of the <canvas> while Chromium targets the <body>. To cope with these and possible future weirdness I attach the event handler to the document and then look to see if it's plausibly related to the canvas. Arguably we might want to handle a wider range of "copy" events, maybe any where the selection isn't empty. I'm not sure, though, so we'll start with the minimal change.
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/>.