The gutter will invalidate its intrinsic size when its width changes which will cause the Cocoa layout engine to update the layout, so no more explicit code to deal with adjusting the gutter’s width.
Likewise, the height of the gutter (not the gutter scroll view) has been setup to match the height of the text view (again, not the containing scroll view). This avoids observing the text view frame and manually updating gutter height to match it.
There is a somewhat frequent crash caused by infinite “did resize” notifications. It’s unclear exactly why this happens, but basically a subview shouldn’t resize itself unless asked, and it shouldn’t resize siblings either.
We now have an explicit sizeToFit which takes care of sizing the gutter view. It is the responsibility of the owner (of this gutter view) to resize the gutter’s parent scroll view and any siblings that may need adjustment (after calling sizeToFit).
Additionally it is the responsibility of the owner to call sizeToFit when there is a chance the gutter view size needs updating. Generally though, the owner should know, as it is the data source for everything.
Use the text foreground color for icons when the theme doesn’t provide a color and introduce ‘gutterSelectionIcons’ for the color of selected icons (defaults to selected foreground color).
Also changed the gutter selection border color to match the divider color (when it isn’t specified by the theme).
Previous solution didn’t handle soft wrapped lines.
This solution also scales better, as we no longer need to break up ranges and create an entry per selected line.
