Well, it ain't a fix, because it's not exactly correct for any of the
themes. Yet it's the best for all of them. If I put what seems to be
correct, "modern" theme gets ruined, because it has this mystical 2px
offset in tabs/scrollcontainers.
- StorageWizardDialog is removed, along with bmps it was using;
- EditTextWidget now accepts custom font in constructor;
- ScrollContainer scrollbar now jumps to top when content height changes
so it's "overscrolled";
- IndexPageHandler now does not awaits for `code` GET-parameter, as
local webserver is no longer used to connect Storages;
- CloudManager and all corresponding Storages are updated to support
disconnecting and to notify about successful connection.
This should also fix this for other instances of ScrollContainer, though
the dialogs / widgets may require the same change.
This fixes bug Trac #10741.
The single step is the amount of scroll done when clicking once on
the scrollbar up or down arrow. It used to be 1 entry, but for the
ScrollContainer 1 entry is 1 pixel, which was too litle. Now the
single step can be set to a multiple entries.
Now it respects outer code's decision to hide or move some widgets
around. Outer code must be CommandReceiver which is set as
ScrollContainer's target.
