The Text Cleaner had two st.dataframe previews — the initial upload
preview ("Preview: filename") and the post-clean "Cleaned preview"
table — that both rendered cells with the same browser-collapses-
whitespace, hides-invisibles problem the analyzer findings panel had
before commit 1049c03.
components.render_hidden_aware_preview(df, n_rows, caption) renders a
DataFrame as an HTML table where:
- every cell uses visualize_hidden_html(mark_outer_whitespace=True),
so leading/trailing ASCII spaces appear as per-character "·" badges
- white-space: pre-wrap on every cell preserves internal multi-space
runs and embedded newlines visually
- headers route through the same visualizer so dirty column names
(NBSP padding, ZWSP, smart quotes) show their badges too
- NaN cells render as a faint "NaN" placeholder
- rows are sticky-headed and scrollable inside a 26rem capped
container so a 10-row preview doesn't push the rest of the UI off
screen
2_Text_Cleaner.py wires it into both previews:
- The upload preview gains its own "Show hidden characters in preview"
toggle (default on).
- The cleaned preview reuses the existing show_hidden toggle that
already governs the Examples changes table, so one switch controls
the whole results section.
Either toggle off falls back to the original st.dataframe view.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Michael
e9c490ae1b