git: Add setting to hide blame info in shared project

Fixes #16814

Implementation strategy:

- introduce share_with_collaborators setting to InlineBlameSettings.

- modify GitStore::handle_blame_buffer to read this setting and send
empty BlameBufferResponse when the value is true.

crates/project/src/git_store.rs

@@ -4,6 +4,7 @@ pub mod git_traversal;
 use crate::{
     ProjectEnvironment, ProjectItem, ProjectPath,
     buffer_store::{BufferStore, BufferStoreEvent},
+    project_settings::ProjectSettings,
     worktree_store::{WorktreeStore, WorktreeStoreEvent},
 };
 use anyhow::{Context as _, Result, anyhow, bail};
@@ -47,6 +48,7 @@ use rpc::{
     proto::{self, FromProto, SSH_PROJECT_ID, ToProto, git_reset, split_repository_update},
 };
 use serde::Deserialize;
+use settings::Settings;
 use std::{
     cmp::Ordering,
     collections::{BTreeSet, VecDeque},
@@ -2244,6 +2246,21 @@ impl GitStore {
         let buffer = this.read_with(&cx, |this, cx| {
             this.buffer_store.read(cx).get_existing(buffer_id)
         })??;
+
+        if envelope.original_sender_id.is_some() {
+            let allowed = this.read_with(&cx, |_, cx| {
+                ProjectSettings::get_global(cx)
+                    .git
+                    .inline_blame_share_with_collaborators()
+            })?;
+
+            if !allowed {
+                return Ok(proto::BlameBufferResponse {
+                    blame_response: None,
+                });
+            }
+        }
+
         buffer
             .update(&mut cx, |buffer, _| {
                 buffer.wait_for_version(version.clone())

crates/project/src/project_settings.rs

@@ -448,6 +448,16 @@ impl GitSettings {
             _ => false,
         }
     }
+
+    pub fn inline_blame_share_with_collaborators(&self) -> bool {
+        match self.inline_blame {
+            Some(InlineBlameSettings {
+                share_with_collaborators,
+                ..
+            }) => share_with_collaborators,
+            _ => true,
+        }
+    }
 }
 
 #[derive(Clone, Copy, Debug, Default, Serialize, Deserialize, JsonSchema)]
@@ -501,6 +511,11 @@ pub struct InlineBlameSettings {
     /// Default: false
     #[serde(default)]
     pub show_commit_summary: bool,
+    /// Allow sending blame information to collaborators in shared projects.
+    ///
+    /// When false, the host will refuse remote blame requests for buffers. Default: true
+    #[serde(default = "default_true")]
+    pub share_with_collaborators: bool,
 }
 
 fn default_inline_blame_padding() -> u32 {
@@ -515,6 +530,7 @@ impl Default for InlineBlameSettings {
             padding: default_inline_blame_padding(),
             min_column: 0,
             show_commit_summary: false,
+            share_with_collaborators: true,
         }
     }
 }