Fixes#2815
This commit changes our autoscroll strategy for cursors significantly.
Originally, we were autoscrolling whenever the cursor's marker changed
positions. This worked well, except we didn't end up autoscrolling when
the user *attempted* to move the cursor to an invalid position, such as
moving down at the end of the buffer, due to the fact that the marker
wouldn't change.
Then, we moved to always requesting an autoscroll whenever a position
change was requested via Cursor::changePosition. This missed out on
moving the cursor when inserting text, so we then also added an explicit
autoscroll call when inserting text.
This had the problem of not autoscrolling due to undo. So finally, this
solution combines explicit autoscroll in ::changePosition to capture
intent, as well as implicit autoscrolling whenever the cursor's marker
position changes due to a textual change in the buffer. This captures
undo/redo correctly.
The indentation level is not anymore reduced by adding a new line,
which previously caused multiple reductions of the indentation level.
This fixes the behavior of HTML closing tags, which currently
"jump" backwards if you try to move them down.
Because lines are opaque and any area of a selection that overlaps a
line is actually rendered on the line itself, the screen-spanning
background of a multi-line selection can actually be rendered as a
single div spanning the entire screen from the first row to the
penultimate row of the selection.
Because lines are opaque on the GPU for sub pixel antialiasing, the
lines obscure the selections which were formerly rendered behind the
lines. This commit renders selection fragments *on* each opaque line
layer so the selections look correct again. Still needs cleanup and
optimization.
Rename functions `backspaceToBeginningOfWord` to `deleteToBeginningOfWord` and
`backspaceToBeginningOfLine to `deleteToBeginningOfLine`.
Rename commands `editor:backspace-to-beginning-of-word` to
`delete-to-beginning-of-word` and `editor:backspace-to-beginning-of-line` to
`editor:delete-to-beginning-of-line`.
Fix#1791
Includes:
- Passing the selection index in the `Editor::mutateSelectedText`
method callback
- Storing all the selections content on many calls of
`Selection::copy` with `maintainClipboard = true` in a metadata
`selections` array
- Handling clipboard with a `selections` metadata in
the`Editor::pasteText` method
