[kpagacz]

Closes #30

Adds use_freeze_tables(), which returns a tagList to include once in the app UI (e.g. teal::init(header = ...)). It makes the header rows and/or the first column of teal.widgets tables sticky.

• rtables renders no <thead>, so a small MutationObserver script moves the leading <th> rows into a <thead> (see Add <thead> and <tbody> tags into output of as_html pharmaverse/rtables#1123).
• module_ids limits freezing to tables inside elements whose id contains any of the given strings.
• Tables use border-collapse: separate. With collapsed borders, Chromium paints the scrolled body text over the sticky header.
• Based on a solution from a colleague. Changes from that version: fixed broken JS quoting when module_ids is used (selectors are now JSON-encoded), added argument checks, used --bs-body-bg for sticky backgrounds, removed empty <tbody> elements left after the restructure, and added tests and an example.

Verified in headless Chrome with the tm_t_summary example: the header stays visible when scrolling vertically, the first column stays visible when scrolling horizontally, and the corner cell stays on top of both.

🤖 Generated with Claude Code

[github-actions]

Code Coverage Summary

Filename                                     Stmts    Miss  Cover    Missing
-----------------------------------------  -------  ------  -------  ---------
R/BlockConditions.R                             21      21  0.00%    23-61
R/create_rel_risk_transformator.R               42      42  0.00%    41-87
R/forest_plot_decorator.R                      164     164  0.00%    97-373
R/freeze_tables.R                              103     103  0.00%    57-166
R/ggplot_decorator.R                           245     245  0.00%    105-376
R/merge_levels_transformator.R                 146     146  0.00%    11-240
R/or_filtering_transformator_view_model.R       27      27  0.00%    25-61
R/or_filtering_transformator.R                 282     282  0.00%    69-397
R/patchwork_plot_decorator.R                    46      46  0.00%    18-68
R/r_access_utilities.R                          46      46  0.00%    32-152
R/ReportManager.R                              401     401  0.00%    41-743
R/title_footer_decorator.R                     142     142  0.00%    105-254
R/tm_report_manager.R                          719     719  0.00%    31-896
R/watermark_decorator.R                         61      61  0.00%    23-87
TOTAL                                         2445    2445  0.00%

Diff against main

Filename             Stmts    Miss  Cover
-----------------  -------  ------  --------
R/freeze_tables.R     +103    +103  +100.00%
TOTAL                 +103    +103  +100.00%

Results for commit: 87dc98b

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[nikolas-burkoff]

@donyunardi may be of interest