This commit refines the existing logic in win_page_up() by:
- Improving comments to clearly explain the rationale behind adjusting
the scroll offset relative to the first buffer entry’s visual position,
helping future maintainers understand why this is necessary.
- Fixing offset recalculation to better handle cases where older messages
with variable heights are loaded from the DB, improving scroll smoothness.
- Changing the logging of negative *page_start values from warning to debug,
recognizing that this can be a normal scenario when insufficient history is loaded.
- Simplifying some conditionals and renaming variables for clearer intent.
No changes yet applied to win_page_down(), but similar improvements could
be considered in the future.
Overall, this enhances the robustness and user experience of scrolling up
in chat windows, while preserving existing functional logic.
f27fa98 commit introduced issue of scrolling seemingly randomly being stuck and the following message flood in the logs: "WRN: Ncurses Overflow..."
A pad is an off-screen buffer — larger than the visible terminal screen — that you can scroll, render parts of, or update selectively.
Unlike regular windows, a pad is not tied to screen size. You can create a pad that's 1,000 lines tall, even if your terminal is only 40 lines tall.
This commit addresses the issue by increasing PAD_SIZE to a reasonable number,
allowing messages from buffer to be displayed without overflowing NCurses' window size (maxy).
Minor change: add .cache folder to gitignore
