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Then i click mouse on the 'Projects explorer' and press Ctrl+F, "Searching dialog" are showing. But then if i click in "text editor"(not "searching dialog") "searching dialog" has missing focus hardly. And other clicks in the "searching dialog" will be through the window while i close it. Sory for english.
The "searching dialog" in not modal, so yes, you will loose focus if you click somewhere else. It is intentional, you can e.g. copy piece of code from editor and paste it to the dialog -> Not a bug
It is bug! Because focus can't be repair after returning into the "searching dialog". Behavior of the buttons and text fields is empty. And this is situation occured time to time but not always.
Are you saying when this happens you still can see the Search dialog but it does not respond to clicks/keyboard events? When you e.g. try to change "Containing text" field it does not change? Please attach the IDE log when this happens and also make a screenshot at the moment you're trying to edit the "Containing text" field. Thanks.