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In Pearl, a mouse-down outside the grid sets ui->ndragcoords to -1. The intended effect of this is to make sure that future drags are ignored, so you can't try to draw a line starting off the grid. However, this also has the effect of clearing any in-progress drag. This can happen if there's a keyboard "drag" in progress at the time. This is arguably wrong, but much more wrong was that interpret_move returned MOVE_UNUSED (and previously NULL) in this case. That meant that the display didn't get updated to show the abandonment of the drag, or the removal of the keyboard cursor that also happened. This commit changes MOVE_UNUSED to MOVE_UI_UPDATE so that at least the effect is correctly visible.
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/>.