When pressing up/down on a node when you can't go up/down the
window will now search for a parent node which is a child of
a branching point, and move to that and try again for the up/down
movement. This makes it slightly more intuitive to move through
the tree.
Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>
Now the core has a helper so that all the front ends don't need
to implement the scroll to show area API.
Now they simply have get and set scroll APIs.
So that we can eventually navigate around local history by
keyboard, add the concept of a history cursor to the local
history core window.
Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>
Move local history display into separate module using corewindow
API. Note this is purely the rendering and teh browser history module
still constructs the history data.
slightly extends the invalidate core window API with error return and
whole window invalidation. Also renames it to be more inline with
browser window API call.
cannot quite reuse browser window API yet as that applies scaling
