[Bug][Comparison View] Saving the file in the active editor will caus…

…e both files to be saved. (fix #190210) (#190944)

src/vs/workbench/contrib/files/browser/fileCommands.ts

@@ -377,11 +377,16 @@ async function saveSelectedEditors(accessor: ServicesAccessor, options?: ISaveEd
 			// has 2 sides, we consider both, to support saving both sides.
 			// We only allow this when saving, not for "Save As" and not if any
 			// editor is untitled which would bring up a "Save As" dialog too.
+			// In addition, we require the secondary side to be modified to not
+			// trigger a touch operation unexpectedly.
+			//
 			// See also https://github.com/microsoft/vscode/issues/4180
 			// See also https://github.com/microsoft/vscode/issues/106330
+			// See also https://github.com/microsoft/vscode/issues/190210
 			if (
 				activeGroup.activeEditor instanceof SideBySideEditorInput &&
-				!options?.saveAs && !(activeGroup.activeEditor.primary.hasCapability(EditorInputCapabilities.Untitled) || activeGroup.activeEditor.secondary.hasCapability(EditorInputCapabilities.Untitled))
+				!options?.saveAs && !(activeGroup.activeEditor.primary.hasCapability(EditorInputCapabilities.Untitled) || activeGroup.activeEditor.secondary.hasCapability(EditorInputCapabilities.Untitled)) &&
+				activeGroup.activeEditor.secondary.isModified()
 			) {
 				editors.push({ groupId: activeGroup.id, editor: activeGroup.activeEditor.primary });
 				editors.push({ groupId: activeGroup.id, editor: activeGroup.activeEditor.secondary });