Ensure query text shows for empty selections

Fixes a bug where quick eval was showing empty query text.

Previously, `getQueryText` was looking up the query text when it was
called if the specified text was empty. This was removed with the
recent changes to query history. It was also a bug since the query file
could have changed after the query was run.

This change ensures that if the quick eval position is empty, the
entire line is returned as the quick eval location.

extensions/ql-vscode/src/run-queries.ts

@@ -542,7 +542,13 @@ export async function determineSelectedQuery(selectedResourceUri: Uri | undefine
       throw new Error('The selected resource for quick evaluation should match the active editor.');
     }
     quickEvalPosition = await getSelectedPosition(editor, range);
-    quickEvalText = editor.document.getText(editor.selection);
+    if (!editor.selection?.isEmpty) {
+      quickEvalText = editor.document.getText(editor.selection);
+    } else {
+      // capture the entire line if the user didn't select anything
+      const line = editor.document.lineAt(editor.selection.active.line);
+      quickEvalText = line.text.trim();
+    }
   }
 
   return { queryPath, quickEvalPosition, quickEvalText };