The keyboard you are looking for is SHIFT + F4 (the action assigned to this shortcut is called Open Source in a new window. When you call this action, an open tab (file) will open in a new one but the file will also remain open in the main window, but I I believe that this is as close as possible to the functionality that you are describing, at least for the moment.
Option 2
Open the Open Class dialog box using CTRL + N to search for the class you want to open in a separate window and press CTRL + SHIFT + ENTER . This will open the class in a new editor window.
Unfortunately, this only works for Java classes, and not for other files ( CTRL + SHIFT + N dialog). I created a bug report for the last problem, so if you think this might be useful, feel free to vote for it.
Bohuslav burghardt
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