Fixes text remnants and extra blank lines when spinner messages change.
Issues fixed:
1. Text remnants when switching from longer to shorter messages (e.g., 'Cleaning...ems...')
2. Extra blank lines appearing after section headers
Root causes:
- \033[K only clears from cursor to end of line, leaving remnants when new messages are shorter
- stop_section_spinner was clearing lines even when no spinner was running
Changes:
- lib/core/base.sh:
- Changed stop_section_spinner(), safe_clear_line(), safe_clear_lines() to use \033[2K
- Added guard in stop_section_spinner to only clear when spinner is actually running
- lib/core/ui.sh:
- Clear line once when starting spinner (before loop) to ensure clean start
- Normal spinner rotation uses \r without clearing (performance optimization)
Performance: Line clearing happens only once per spinner start, not on every loop iteration.
Fixes#390
e12a40f6bf