Find/Replace: streamline editability checking and improve tests #2061
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The logic for checking editability of the target of a FindReplaceOverlay is slightly scattered, resulting in not being capable of dealing with a change in the editability of the target editor.
This change streamlines the editability checking by dynamically adapting visibility replace-related widgets visibility instead of static (non-)creation of the widget.
To test this functionality, the test classes for the FindReplaceDialog and FindReplaceOverlay are adapted to properly reuse a FindReplaceAction once instantiated for a target instead of recreating it.