The binding uses the `!important` selector to ensure that the editor
always gets a chance to clear multiple selections before other bindings
for escape are processed.
Just like the cursor clears its goal column when it is moved in any
way other than vertically, the selection clears its goal range (the
range it will attempt to use when adding a selection below) when it
is changed in any way.
Previously, if a selection was added and removed before the editor got
a chance to update its display, it would try to add a selection view
for the destroyed selection. Now we check the new selections and
cursors to make sure they aren't destroyed before we add views for
them.
Just like the cursor tries to stay in its "goal column" when moving
vertically, here we try to keep the same selection even when adding
across shorter lines.
This required changing text-buffer to support having a
path but not underlying file that exists yet.
Now calling RootView.open() with a non-existed path will
open a dirty empty editor to the path and the file will be
created on first save.
Previously EditSession.backspaceToBeginningOfLine() would do nothing
if at the beginning of the line.
Now it selects left and does a delete so it can be used to delete
multiple lines continuously without having to move the cursor.
Refs #134
Previously, logic associated with swapping grammars was a bit
scattered. Now grammar reloading / assignment methods delegate to
LanguageMode directly, and it emits a 'grammar-changed' event when
the grammar changes. Now EditSession and TokenizedBuffer listen for
this event and perform necessary actions for grammar change.
This is more consistent with other range-oriented methods on
EditSession. At this layer, we need to be explicit about what kind
of range we are talking about.
This makes it easy to only assign variables for the information you
need in the iterator. Before, we always forced you to take a match and
a range as the first two arguments even if you weren't using them.
Since buffers are now serialized directly, previous versions of the
EditSession state which used the buffer's path as the `buffer` key
are no longer valid.
