Simon Tatham 35f796542e Singles: fix error highlighting when grid is disconnected.
The loop that selects one of the disconnected regions (represented as
equivalence classes in a dsf) to _not_ highlight as an error was
failing to call dsf_canonify() to get the canonical element of the
class.

Instead, it was relying on having met the canonical element of the
class first, because it iterates up the array in order, and in the old
dsf implementation, canonical elements were always minimal ones. But
the DSF refactoring made that untrue, so now we have to explicitly
canonify each value we come to.

Thanks to Steffen Bauer for the diagnosis and suggested fix.
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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/>.
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