https://bugs.kde.org/show_bug.cgi?id=479779
Bug ID: 479779
Summary: textDocument/formatting LSP message causes duplication
of buffer text
Classification: Applications
Product: kate
Version: 23.08.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: application
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 164889
--> https://bugs.kde.org/attachment.cgi?id=164889&action=edit
debug log from kate, with lsp logs
SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug
symbols.
See
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***
Given the following document of Nix code:
let x = 5;
in 1
When the formatting button is pressed using the nixd language server, the
following becomes the buffer content:
in 1
let x = 5;
in 1
This is essentially pasting the content of the file a second time, which is a
bug. This does not happen in neovim with coc, and I strongly suspect this is a
bug in kate's LSP client.
This is what the language server responds to the format request with:
"{\"id\":4,\"jsonrpc\":\"2.0\",\"result\":[{\"newText\":\"let x = 5;\\nin
1\\n\",\"range\":{\"end\":{\"character\":2147483647,\"line\":2147483647},\"start\":{\"character\":0,\"line\":0}}}]}"
This message is intending to overwrite the entire contents of the file with the
provided text. However, kate seems to do something different with it.
I have attached a full debug log of the LSP interaction.
I ran kate with the following:
LSPCLIENT_DEBUG=1 QT_FORCE_STDERR_LOGGING=1
QT_LOGGING_RULES='katelspclientplugin=true;default.debug=true' kate --startanon
-b bad.nix
STEPS TO REPRODUCE
0. Acquire nixd and nixpkgs-fmt from nixpkgs. If you have nix, this can be done
with `nix-shell -p nixd nixpkgs-fmt`, then running kate from the resulting
shell.
1. Configure kate with nixd like so:
{
"servers": {
"nix": {
"command": ["nixd"],
"highlightingModeRegex": "^Nix$"
}
}
}
2. Write this into bad.nix:
let x = 5;
in 1
3. Press the LSP format button
4. Get mangled text
OBSERVED RESULT
Text is mangled.
EXPECTED RESULT
Text should be replaced with the new text from the language server.
SOFTWARE/OS VERSIONS
Operating System: NixOS 24.05
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.11
Kernel Version: 6.1.69 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7700HQ CPU @ 2.80GHz
Memory: 31.2 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 630
ADDITIONAL INFORMATION
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