Add support for black&white ice (3.7.0 feature) similar to already supported black&white lava: show in inverse video if it uses the same character as floor (in the ice case; as water in the lava case). Inverse for monster detection, black&white lava, and now black&white ice was being done unconditionally but has been changed so that the user can disable it by toggling the 'use_inverse' run-time option. [Bug noticed in the process: if you move an inverse video cursor onto inverse video detected monster/lava/ice (when doing farlook, for instance), the cursor disappears. I'm not sure how to address that.]
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56 KiB