default value: `unknown`. This will be automatically overridden depending
on the file you open.
+* `hlsearch`: highlight all instances of the searched text after a successful
+ search. This highlighting can be turned off via `UnhighlightSearch` action
+ (triggered by Esc key by default) or toggled on/off via `ToggleHighlightSearch`
+ action. Note that these actions don't change `hlsearch` setting.
+ As long as `hlsearch` is set to true, after the next search the highlighting
+ is turned on again.
+
+ default value: `false`
+
* `incsearch`: enable incremental search in "Find" prompt (matching as you type).
default value: `true`