ClangCodeModel: Adjust cursor for following destructor symbols

... with clangd. More specifically, for the case where we switch between
declaration and definition of a destructor. Since clangd expects the
cursor before the "~" character, we move it there.

Fixes: QTCREATORBUG-26809
Change-Id: I8ea6a060bea3545c963cb8ebbe2d3ae3a18da2d5
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/clangcodemodel/clangdclient.cpp

@@ -2458,6 +2458,13 @@ QTextCursor ClangdClient::Private::adjustedCursor(const QTextCursor &cursor,
             }
             return cursor;
         }
+
+        // ~My|Class
+        if (const DestructorNameAST * const destrAst = (*it)->asDestructorName()) {
+            QTextCursor c = cursor;
+            c.setPosition(posForToken(destrAst->tilde_token));
+            return c;
+        }
     }
     return cursor;
 }