Fixes#2204
We didn't previously use PromptMode.download for MHTML download prompts
to avoid dealing with thinks like "Open download", but the new download
prompt is just way better than the old, which justifies the extra work.
This means that MHTML downloads can now also be opened directly.
This initially seemed like a nice feature, but it means 0 can't be bound
as a separate key anymore, and 0<Esc> gives weird error messages...
Reverts #1953.
Fixes#2032.
When starting a download due to unsupportedContent being emitted, we
need to use (and later adopt) the page's QNetworkAccessManager.
Since we need the whole adopting logic for that case anyways, let's keep
things as they were and always run downloads in per-tab QNAMs.
This reverts 53e360ec4b and fixes#2134.
webelem.text() was only used without use_js=True from webelem.__str__.
Now we instead default to the use_js=True behavior and renamed the
method from text() to value().
The old behavior is instead directly implemented in __str__.
This changes how webelem.value (aka text) handles elements for which
is_content_editable() returns True, but I haven't found any cases where
this makes a difference.
This also fixes getting existing text from elements with QtWebEngine,
which closes#1957.
This makes a lot of code eaiser, and we don't have per-tab settings yet
anyways. Also, with QtWebEngine, we can't honour any per-tab settings
for downloads...
We had some funny segfaults reported during scrolling (i.e. with
QApplication.sendEvent), and some code already had to use postpone=True
so there was no segfault...
So now we're back to postEvent again, and eliminated the main reason for
segfaults with it, which was re-using (and -posting) events which had
already been posted.
At least during tests this seems to run stable, let's hope it helps for
the people having crashes as well.
