fix: --preview-window wrap breaks preview scrolling in some condition
#4647
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When preview content with wrap mode fills the window exactly (returning FillSuspend), the scrollable flag was not being set to true. This caused scrolling to be disabled even when there was more content to scroll to. The fix sets scrollable = true whenever FillSuspend is returned, both when rendering content and when filling the trailing newline. Fixes junegunn#4258 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> Signed-off-by: majiayu000 <1835304752@qq.com>
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Fixes #4258
Changes
scrollable = truewhenFillSuspendis returned during preview rendering