Merge pull request LMFDB#7156 from roed-math/ai/t21-rcs-knowl-layout

Keep knowl expansion from shifting table columns on /rcs

Author: roed314

lmfdb/templates/style.css

@@ -1174,6 +1174,15 @@ table .knowl a {
  margin-left: 0;
  margin-right: 0;
 }
+/* Knowls opened inside a table cell insert a new full-width row (see
+   knowl_click_handler in lmfdb.js).  Inline-size containment keeps that row
+   from being counted when the browser computes the column widths, so opening
+   a knowl no longer pushes the other columns around (issue #6501): the box
+   simply spans the table's current width.  The .knowl-content overflow rule
+   above handles content that is wider than the available box. */
+td > .knowl-output {
+  contain: inline-size;
+}
 .knowl-output.loading {
  color: {{color.grey}};
  font-style: italic;