internal/lsp: use the correct dynamic registration booleans

I mistakenly used DynamicConfigurationSupported for all capabilities,
not just the workspace/configuration one.

Fixes golang/go#48600

Change-Id: Ie9b205d89da6e4d110a5310b31fc1ba22f2b5383
Reviewed-on: https://go-review.googlesource.com/c/tools/+/352055
Trust: Rebecca Stambler <rstambler@golang.org>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>

internal/lsp/general.go

diff --git a/internal/lsp/general.go b/internal/lsp/general.go
index 3c409d3..e699188 100644
--- a/internal/lsp/general.go
+++ b/internal/lsp/general.go
@@ -188,20 +188,17 @@
 	}
 	s.pendingFolders = nil
 
+	var registrations []protocol.Registration
 	if options.ConfigurationSupported && options.DynamicConfigurationSupported {
-		registrations := []protocol.Registration{
-			{
-				ID:     "workspace/didChangeConfiguration",
-				Method: "workspace/didChangeConfiguration",
-			},
-			{
-				ID:     "workspace/didChangeWorkspaceFolders",
-				Method: "workspace/didChangeWorkspaceFolders",
-			},
-		}
-		if options.SemanticTokens {
-			registrations = append(registrations, semanticTokenRegistration(options.SemanticTypes, options.SemanticMods))
-		}
+		registrations = append(registrations, protocol.Registration{
+			ID:     "workspace/didChangeConfiguration",
+			Method: "workspace/didChangeConfiguration",
+		})
+	}
+	if options.SemanticTokens && options.DynamicRegistrationSemanticTokensSupported {
+		registrations = append(registrations, semanticTokenRegistration(options.SemanticTypes, options.SemanticMods))
+	}
+	if len(registrations) > 0 {
 		if err := s.client.RegisterCapability(ctx, &protocol.RegistrationParams{
 			Registrations: registrations,
 		}); err != nil {

internal/lsp/source/options.go

diff --git a/internal/lsp/source/options.go b/internal/lsp/source/options.go
index cb4b11d..4875111 100644
--- a/internal/lsp/source/options.go
+++ b/internal/lsp/source/options.go
@@ -81,13 +81,14 @@
 		}
 		defaultOptions = &Options{
 			ClientOptions: ClientOptions{
-				InsertTextFormat:                  protocol.PlainTextTextFormat,
-				PreferredContentFormat:            protocol.Markdown,
-				ConfigurationSupported:            true,
-				DynamicConfigurationSupported:     true,
-				DynamicWatchedFilesSupported:      true,
-				LineFoldingOnly:                   false,
-				HierarchicalDocumentSymbolSupport: true,
+				InsertTextFormat:                           protocol.PlainTextTextFormat,
+				PreferredContentFormat:                     protocol.Markdown,
+				ConfigurationSupported:                     true,
+				DynamicConfigurationSupported:              true,
+				DynamicRegistrationSemanticTokensSupported: true,
+				DynamicWatchedFilesSupported:               true,
+				LineFoldingOnly:                            false,
+				HierarchicalDocumentSymbolSupport:          true,
 			},
 			ServerOptions: ServerOptions{
 				SupportedCodeActions: map[FileKind]map[protocol.CodeActionKind]bool{
@@ -183,18 +184,19 @@
 // ClientOptions holds LSP-specific configuration that is provided by the
 // client.
 type ClientOptions struct {
-	InsertTextFormat                  protocol.InsertTextFormat
-	ConfigurationSupported            bool
-	DynamicConfigurationSupported     bool
-	DynamicWatchedFilesSupported      bool
-	PreferredContentFormat            protocol.MarkupKind
-	LineFoldingOnly                   bool
-	HierarchicalDocumentSymbolSupport bool
-	SemanticTypes                     []string
-	SemanticMods                      []string
-	RelatedInformationSupported       bool
-	CompletionTags                    bool
-	CompletionDeprecated              bool
+	InsertTextFormat                           protocol.InsertTextFormat
+	ConfigurationSupported                     bool
+	DynamicConfigurationSupported              bool
+	DynamicRegistrationSemanticTokensSupported bool
+	DynamicWatchedFilesSupported               bool
+	PreferredContentFormat                     protocol.MarkupKind
+	LineFoldingOnly                            bool
+	HierarchicalDocumentSymbolSupport          bool
+	SemanticTypes                              []string
+	SemanticMods                               []string
+	RelatedInformationSupported                bool
+	CompletionTags                             bool
+	CompletionDeprecated                       bool
 }
 
 // ServerOptions holds LSP-specific configuration that is provided by the
@@ -655,6 +657,7 @@
 	// Check if the client supports configuration messages.
 	o.ConfigurationSupported = caps.Workspace.Configuration
 	o.DynamicConfigurationSupported = caps.Workspace.DidChangeConfiguration.DynamicRegistration
+	o.DynamicRegistrationSemanticTokensSupported = caps.TextDocument.SemanticTokens.DynamicRegistration
 	o.DynamicWatchedFilesSupported = caps.Workspace.DidChangeWatchedFiles.DynamicRegistration
 
 	// Check which types of content format are supported by this client.