Logging panel is too short

[detly]

I am trying to debug an issue with rust-analyzer. According to the RA docs I can get some useful information out of it by increasing logging. When I do that, by the time I can open the LSP log panel, the relevant messages are gone.

To Reproduce
Steps to reproduce the behavior:

1. Go to Preferences > Package Settings > LSP > Settings.

2. Add:

   {
       "clients":
       {
   
           "rust-analyzer":
           {
               "command": ["~/.cargo/bin/rustup", "run", "nightly", "rust-analyzer"],
               "enabled": true,
               "env": {
                   "RA_LOG": "rust_analyzer=info",
               }
           },
       },
       "log_max_size": 0,
   }

   (Note that the command will probably have to change depending on how you installed RA.)

3. Restart the language server, or open a Rust project.

4. Open the LSP log panel.

5. Watch as the relevant messages disappear out of the top of the panel.

I am not just talking about scrolling here, scrolling the panel contents up will still hit this limit.

This information is not available via the remote log setting.

Expected behavior
I would expect to be able to set this somewhere.

Screenshots

Here's a GIF! I did not want to capture my actual code, but shortly after the GIF starts, I am restarting the RA language server.

Environment:

• OS: Ubuntu 21.04
• Sublime Text version: 4113
• LSP version: 1.7.0
• Language servers used: rust-analyzer

[rchl]

There is the log_max_size setting that you can increase.

Though maybe if the server has so much output, it would be best to also support logging to file.

[detly]

I could be wrong, but I think that setting is for line length, not total number of lines. At any rate, setting it to zero did not change this.

[predragnikolic]

Found the cause.

There is a hard-coded value.

LSP/plugin/core/panels.py

Line 8 in fe36b2d

SERVER_PANEL_MAX_LINES = 500

The content of the panel is deleted with this code:

LSP/plugin/core/panels.py

Lines 191 to 192 in fe36b2d

	if not erase_region.empty():
	self.view.erase(edit, erase_region)

IMO not sure if the delete code is necessary.

[rchl]

Well, without it the log would fill up with no end. Could easily reach megabytes of text. Also I guess the syntax highlighting would stop working after some point.