we do the backup compression/writing in a separate thread so it
doesn't slow down profile switching/syncing, and remove the option
to write uncompressed backups
the strip html option is no longer used, so remove it from preferences
- a few issues to work out still, and editor changes not done yet
- for communication between webengine and python code, we set window
.location to 'http://anki/<something>' - the leading http is
necessary for qt to call the link handler, which was introduced
in qt5.5
- the designer files now use a promoted qobject to create instances
of AnkiWebView
- we use the css zoom property to alter webengine font size based on
system dpi
- prefs and addons folder stored in new location (at least for now)
avoided adding this in the past as on a multi user system it allows
one profile user to annoys others by changing the interface language,
but it comes at the expense of easily changing the language for users
who choose the wrong one on first startup
Closing anki when the preferences dialog
is open will cause an exception since
self.mw.col in Preferences is not available
anymore.
Avoid the exception by checking self.mw.col
again on accept().
