The inspection widget and the Review Mode group float in `.cm-editor`,
outside `.cm-scroller`: they neither scroll with the text nor count in
`scrollWidth`, so at full horizontal scroll the last characters of a line
landed under them.
Reserve the corner's measured width in the lines' right padding, next to
the room the fixed padding already keeps for the overview lane.
Co-authored-by: yhqian <[email protected]>
Co-authored-by: Claude Code <[email protected]>
