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If you have a particularly large number of clues in a row, they can end up falling off the left edge of the window. This used not to be a problem because the rendering code would squash them closer together if necessary. But then I switched to drawing them all as a single string (so that two-digit row clues would get enough space with a large font) and that broke the old mechanism. Now we detect if there are enough clues that our conservative guess at the string length looks like overflowing in the big font, and switch to the small one if necessary. If we had a drawing call to measure a string then we could be cleverer about this, but we don't. This problem can be demonstrated with "7x1:1//1//1//1/1.1.1.1" in the GTK port with the fonts my laptop has. I think overflow can still occur even with a small font, so once I've demonstrated that I'll try to fix it.
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/>.