bug#61436: Emacs Freezing With Java Files

[Hank Greenburg]

I was just able to reproduce this 5 times in a row with doing the steps below. 

Launch with emacs -Q

org-babel-execute-src-block for the Repos block and Hyperbole. The Hyperbole 
block won't work unless you do the Repos block first.

Go to the Java file. Hold CTRL + Up/Down Arrow keys to quickly move through the 
file. 

This works just fine until which-function-mode is activated. After that is 
activated I can scroll through maybe twice before it freezes. 

It almost always happens after hitting the end of the file, and the first jump 
up after that. Or at least it has happened 4/5 times by doing that. The other 
time I avoided the end of the file to see if that was the trigger and it still 
froze. 



------- Original Message -------
On Sunday, February 12th, 2023 at 12:30 AM, Eli Zaretskii <eliz@gnu.org> wrote:


> 
> 
> > Cc: 61436@debbugs.gnu.org
> 
> > Date: Sun, 12 Feb 2023 00:24:49 +0000
> > From: Hank Greenburg via "Bug reports for GNU Emacs,
> > the Swiss army knife of text editors" bug-gnu-emacs@gnu.org
> > 
> > To follow up on this, somehow disabling which-function-mode from my config 
> > has solved the problem. That
> > doesn't make sense though because I didn't add that until after it had 
> > frozen in the first place. I know that for
> > certain because I had to use IntelliJ and got the idea for using 
> > which-function-mode from IntelliJ.
> > 
> > To clarify, this froze every single time I tried to edit the file no matter 
> > what modes I had turned on or off. It
> > happened at least 40 times in total and never once was I able to actually 
> > edit the file within Emacs. After
> > disabling which-function-mode though I have restarted Emacs a few times, 
> > written in the file, scrolled though
> > it all without a single hiccup.
> > 
> > So my problem is seemingly solved but there is an underlying bug somewhere 
> > that I'm not really able to
> > isolate aside from disabling which-function-mode.
> 
> 
> If I visit the file you posted, and then turn on which-function-mode
> in it, I cannot reproduce the freezes. Scrolling through the file
> becomes slower, but nowhere near "freezing".
> 
> Do you see something different when you enable just
> which-function-mode in "emacs -Q"?
>