refactor: notify editors on vcs_content updates

src/tui/editor.zig

@@ -1857,6 +1857,10 @@ pub const Editor = struct {
             tp.self_pid().send(.{ "cmd", "save_file", .{} }) catch {};
     }
 
+    pub fn vcs_content_update(self: *const Self) !void {
+        _ = try self.handlers.msg(.{ "E", "update" });
+    }
+
     fn send_editor_eol_mode(self: *const Self, eol_mode: Buffer.EolMode, utf8_sanitized: bool, indent_mode: IndentMode) !void {
         _ = try self.handlers.msg(.{ "E", "eol_mode", eol_mode, utf8_sanitized, indent_mode });
     }

src/tui/mainview.zig

@@ -1976,5 +1976,7 @@ pub fn vcs_content_update(self: *Self, m: tp.message) void {
     if (m.match(.{ "PRJ", "vcs_content", tp.extract(&file_path), tp.extract(&vcs_id), tp.extract(&content) }) catch return) {
         const buffer = self.buffer_manager.get_buffer_for_file(file_path) orelse return;
         buffer.set_vcs_content(vcs_id, content) catch {};
+        if (self.get_editor_for_buffer(buffer)) |editor|
+            editor.vcs_content_update() catch {};
     }
 }