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I use search with regular expresion. Steps to reproduce: 1) Open find in files dialog and fill regular expresion text field.( e.g. type a space character ) 2) Do a search. 3) Double click to any file object in results dialog 4) Click to positions within the file Try to remove highlighting. I try close editor, toggle highlight search (from toolbar and shortcut Alt-Shift-H), but without success.
It is not specified when should the highlighting go off. I suggest the highlighting would be displayed as long as it reflects data displayed in the Search Results dialog. I.e. it would disappear when the Search Results dialog is closed or when a new search is invoked.
Bug #19208 ("regular expresion search dialog works differently than substring search") is now fixed and the highlighting mentioned in this bug report is no longer used. I mark this bug as FIXED.