feat(lsp): support diagnostic refresh request

runtime/doc/lsp.txt

@@ -360,6 +360,7 @@ They are also listed below.
 - `'workspace/applyEdit'`
 - `'workspace/configuration'`
 - `'workspace/executeCommand'`
+- `'workspace/diagnostic/refresh'`
 - `'workspace/inlayHint/refresh'`
 - `'workspace/semanticTokens/refresh'`
 - `'workspace/symbol'`

runtime/doc/news.txt

@@ -282,6 +282,8 @@ LSP
 • |vim.lsp.ClientConfig| has an `exit_timeout` field to control the timeout of
   client force stopping. Defaults to `false`.
 • |Client:stop()| now uses the `Client.exit_timeout` field to control the default of `force`.
+• Support for `workspace/diagnostic/refresh`:
+  https://microsoft.github.io/language-server-protocol/specification/#diagnostic_refresh
 
 LUA
 

runtime/lua/vim/lsp/diagnostic.lua

@@ -388,6 +388,26 @@ local function refresh(bufnr, client_id, only_visible)
   end
 end
 
+--- |lsp-handler| for the method `workspace/diagnostic/refresh`
+---@param ctx lsp.HandlerContext
+---@private
+function M.on_refresh(err, _, ctx)
+  if err then
+    return vim.NIL
+  end
+  for bufnr in pairs(vim.lsp.get_client_by_id(ctx.client_id).attached_buffers or {}) do
+    for _, winid in ipairs(api.nvim_list_wins()) do
+      if api.nvim_win_get_buf(winid) == bufnr then
+        if bufstates[bufnr] and bufstates[bufnr].pull_kind == 'document' then
+          refresh(bufnr)
+        end
+      end
+    end
+  end
+
+  return vim.NIL
+end
+
 --- Enable pull diagnostics for a buffer
 ---@param bufnr (integer) Buffer handle, or 0 for current
 function M._enable(bufnr)

runtime/lua/vim/lsp/handlers.lua

@@ -649,6 +649,11 @@ RSC['window/showDocument'] = function(_, params, ctx)
   return { success = success or false }
 end
 
+---@see https://microsoft.github.io/language-server-protocol/specification/#diagnostic_refresh
+RSC['workspace/diagnostic/refresh'] = function(err, result, ctx)
+  return vim.lsp.diagnostic.on_refresh(err, result, ctx)
+end
+
 ---@see https://microsoft.github.io/language-server-protocol/specification/#workspace_inlayHint_refresh
 RSC['workspace/inlayHint/refresh'] = function(err, result, ctx)
   return vim.lsp.inlay_hint.on_refresh(err, result, ctx)

runtime/lua/vim/lsp/protocol.lua

@@ -609,7 +609,7 @@ function protocol.make_client_capabilities()
         refreshSupport = true,
       },
       diagnostics = {
-        refreshSupport = false,
+        refreshSupport = true,
       },
     },
     experimental = nil,

test/functional/plugin/lsp/diagnostic_spec.lua

@@ -607,5 +607,19 @@ describe('vim.lsp.diagnostic', function()
       eq('related bad!', related_diagnostics[1].message)
       eq('spongebob', relatedPreviousResultId)
     end)
+
+    it('refreshes diagnostics on request', function()
+      eq(
+        1,
+        exec_lua(function()
+          vim.lsp.diagnostic.on_refresh(nil, nil, {
+            method = 'workspace/diagnostic/refresh',
+            client_id = client_id,
+          })
+
+          return _G.requests
+        end)
+      )
+    end)
   end)
 end)