+* `incsearch`: enable incremental search in "Find" prompt (matching as you type).
+
+ default value: `true`
+
+* `ignorecase`: perform case-insensitive searches.
+
+ default value: `true`
+
+* `indentchar`: sets the indentation character. This will not be inserted into
+ files; it is only a visual indicator that whitespace is present. If set to a
+ printing character, it functions as a subset of the "show invisibles"
+ setting available in many other text editors. The color of this character is
+ determined by the `indent-char` field in the current theme rather than the
+ default text color.