forbid text selection on normal headline rows / unexpanded CDM rows to prevent annoying glitches when selecting ranges etc

css/default.css

@@ -196,6 +196,7 @@ body.ttrss_main .hl {
   flex-wrap: nowrap;
   background: #f5f5f5;
   align-items: center;
+  user-select: none;
 }
 body.ttrss_main .hl > * {
   white-space: nowrap;
@@ -1368,6 +1369,9 @@ div#floatingTitle.Unread a.title {
   font-weight: normal;
   cursor: pointer;
 }
+.cdm.expandable:not(.active) {
+  user-select: none;
+}
 .cdm.expandable.Unread {
   background: white;
 }