Minor nit: Double clicking a source file containing multiple classes doesn't open the source file

Can't reproduce, double click opens the file for me even if it has multiple classes.

You can file a bug at https://youtrack.jetbrains.com/issues/IDEA with more details (idea.log, OS, window manager, screencast of the problem, etc).

Serge, here's something I just discovered.

IF the java file with multiple classes is part of a directory marked excluded, then double clicking it opens the file every time.  It seems as if it needs to be actively compiled in order for it to be recognized as having multiple classes.

IF the java file is part of the module normally, double clicking it merely expands out an indented listing of classes underneath it.

So PLEASE VERIFY: If double clicking the java file always opens it in a tab, how do *you* expand it out to the class list?  Double clicking is what normally does that.

Splash screen:

(2017.3.4)

https://drive.google.com/open?id=1dnWlJBvS4DOJKQ0NLDqEOPIecafi6txy

For me double clicking both expands it and opens an editor tab.

So how do you expand it to get the list of classes then?

BTW, not inner classes, but co-existing top level classes.  I'm talking about files like this (in Example.java):

public class Example

{

.....

}

class One {...}     // still in Example.java

class Two {....}    // still in Example.java

class Three {.....}  // still in Example.java

And double clicking the file entry:

> Example

will produce this:

V Example

(indent)One

(indent)Two

(indent)Three

So how do you replicate the above if you double clicking the file opens it up in the editor?  Is there a setting?  Were you never able to get the above behavior?

Clicking on the triangle expands/collapses without opening the file.

Double clicking on the node both expands/collapses and opens the file in the editor.

https://i.imgur.com/nUZBtir.gifv

Almost 4 years later and I also have this issue. 

Almost 6 years later and I also have this issue. 

Ricardo Santos 
Please vote and follow this issue: https://youtrack.jetbrains.com/issue/IDEA-333276 for progress updates.
As a workaround you can enable Open Files with Single Click option in the Project tool window options. However, all files will then open on single mouse click, not only ones with multiple classes.