v12.0.0

Breaking changes:

• python-lsp-server replaces python-language-server as default language server for Python.
• rust-analyzer replaces rls as default language server for Rust (#578).

Additions:

• lsp-handle-progress gained a default implementation that shows an hourglass (⌛) in the modeline when a language server is busy (f8a8cf8).
• The code action menu now provides fuzzy (subsequence) filtering but no longer provides <c-n>/<c-p> due to implementation reasons (b4ee2a3).
• When accepting a completion, any additionalTextEdits are now applied. For example, rust-analyzer adds import statements this way (2637b26).
• New command lsp-code-action-sync is the synchronous variant of lsp-code-action, suitable for use in BufWritePre hooks (#582).
• The default configuration for semantic_tokens now uses a more condensed syntax (#587).
• Some systems' C libraries ship old Unicode databases, but terminals often bundle newer versions. To avoid graphical glitches, emoji are only used if they are assigned display width 2 by the C library's wcwidth(3) (73c2d1a, c3aeb0d).
• The clangd protocol extension for offset encoding negotiation is now supported, which means kak-lsp now uses UTF-8 offsets if the server supports them (#485).

Bug fixes:

• lsp-formatting-sync now works again with texlab instead of blocking forever (regressed in 11.0.0) (a12831a).
• Certain text edits (such as some code actions from rust-analyzer) were not applied correctly, which has been fixed (35ba8de).