also allow disabling the diff provider entirely

Author: doy

helix-view/src/document.rs

@@ -1618,6 +1618,9 @@ impl Document {
                     self.set_diff_base(self.text.clone());
                 }
             }
+            DiffSource::None => {
+                self.diff_handle = None;
+            }
         }
 
         self.version_control_head = match diff_provider.get_current_head_name(path) {

helix-view/src/editor.rs

@@ -79,6 +79,7 @@ pub enum DiffSource {
     #[default]
     Git,
     File,
+    None,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]