How to create two editor panes for the same file?
I usually have a vertical split with two editor panes next to each other. Is there a way to have the same file in both of these panes?
Alt-Shift-Enter
In the 'Open File' or 'Go To Class' dialog, or Project view, press Alt-Shift-Enter (instead of just Enter) to have the selected file open in the current pane even if it's already open in another pane.
Shift-Enter will open the file in a floating window.
Older versions of IntelliJ
In older versions of IntelliJ (maybe before IntelliJ 2016): this shortcut was just Shift-Enter.
Newer versions of IntelliJ (2019.2)
Shift-Enter
IntelliJ IDEA 15
3 approaches
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Right click on the file tab > Split Vertically / Split Horizontally
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Being in the file that you want to split, press Ctrl + Shift + A > type "Split Vertically" / "Split Horizontally" > Enter
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Being in the file that you want to split, Window > Editor Tabs > Split Vertically / Split Horizontally
It's possible in IntelliJ 10. First, use "Window -> Split Vertically" like Mr Rothgiesser suggests; this will open the same file in two panes in your single window. But then, to get it in a separate window, click and drag the tab from the newly-created pane off the original window into its own space on the desktop (that sounds more complicated than it is--just drag the tab off the window).
The file is now open in both windows, synchronized just as Mr Midwood suggests.
Yes.If you have only one file open and then click "Window > Split Vertically", you get the same file on both sides. At least in IntelliJ IDEA 6.0.
Press Shift-Ctrl-Enter if you use IdeaVim and want same file get opened in an active tab group.