[REG] loadFinished signal is sometimes not emitted

Hello,

after updating to QtWebEngine 5.15.3 the loadFinished signal is sometimes not emited and page keeps loading. The page will never stop loading even when we request it to stop with QWebEngineView::stop() function;

This seems to be related to:

• https://bugreports.qt.io/browse/QTBUG-65223

• https://bugreports.qt.io/browse/QTBUG-87089

• https://code.qt.io/cgit/qt/qtwebengine.git/commit/?id=b719da05c6429d72f4e0e0af44da0bf3f3e57984

Thank you for your help.

Summary from our bug report: https://bugs.kde.org/show_bug.cgi?id=434203

> After updating qt5-webengine to 5.15.3-2, some pages do not finish loading in Falkon. Some sites will initially load normally(eg. Youtube), but after navigating to another part of the site (eg. from homepage to subscriptions), never stop loading (despite having seemingly finished) and cannot be stopped/reloaded. Other sites (eg. Twitter) never stop loading at all. Others still (eg. Google) load and navigate normally. <

Thank you for your help.