After trying to increase available localStorage using QWebSettings::setOfflineStorageDefaultQuota(0xffffffff);, localStorage is still limited to 5 MB. The problem is that lower level WebKit respects the limits set with Settings::setLocalStorageQuota - which isn't accessible through the Qt API layer. IMO the fix is for QWebSettings::setOfflineStorageDefaultQuota(x) to call Settings::setLocalStorageQuota(x). Note, however, that the former takes a 64bit value while the latter takes a 32bit value.
Created attachment 115613 [details] Proposed patch
Actually the proposed patch isn't going to work with the current version anymore (it was against the version of QtWebkit shipped with Qt 4.7.4) because the localStorage quota has moved to GroupSettings, which isn't accessible to global QWebSettings. The most reasonable thing to do seems to be adding a setLocalStorageQuota API to QWebPage - the only thing to do without breaking the existing API that I can think of would be doing d->page->group().groupSettings()->setLocalStorageQuotaBytes(QWebSettings::globalSettings()->offlineStorageDefaultQuota()) in the QWebPage constructor
I have recently encouter the similar problem, my fix is: 1) Change the QWebSettings ctor, & make an empty WebCore::Settings object: QWebSettings::QWebSettings() //: d(new QWebSettingsPrivate) : d(new QWebSettingsPrivate(WebCore::Settings::create(0).leakPtr())) { ... 2) Change WebCore/page/Settings.cpp, add NULL-check to every m_page->xxx calls.
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