This ensures the drive letter is consistent on Windows for when
package paths are compared to the resources path to determine
whether to use the metadata cache for a bundled package.
Closes#3932
Do it previously in window-bootstrap caused several things to not be
included such as requiring coffee script and atom shell modules.
Now it is a much more accurate representation of on load time.
These were currently undocumented in the styleguide, had hard-coded colors,
weren't being styled by the default light/dark UI themes, and were unused.
They were also causing conflicts with the notification token scope that
the Objective-C grammar uses.
This allows the line height to be styled via CSS. I would actually
like to allow all these properties to be assigned via CSS rather than
explicitly via the settings view, but that can be deferred until the
old editor is removed.
The goal is to make the editor behave like a standard block-level
element.
The horizontal behavior is simple: we stretch horizontally to fill our
container.
The vertical behavior is more nuanced. If an explicit height is assigned
on the wrapper view, we honor that height. But if no explicit height is
assigned, the editor stretches vertically so that its contents are
visible.
This prepares us to support mini editors, which need to be 1-line tall
without an explicit height assignment.
Trying to make the .highlights layer double as the .underlayer was
causing GPU artifacts on the wrap guide when the last highlight was
removed. This puts it in its own layer to avoid that.
Previously, when the last highlight div was removed from the lines
layer, chunks of the lines would sometimes disappear. Since we've
discovered that giving the lines an opaque background doesn't help with
subpixel anti-aliasing anyway, I've found that rendering highlights on
their own layer behind the lines and making the lines layer transparent
avoids the arficacts.
