[IvanHCenalmor]

Part of CellMigrationLab/LabConstrictor-Tools#147: this is the QuPath step (Tools spec: Tools #151; napari: CellMigrationLab/LabConstrictor-napari#81, merged; Fiji follows).

What changes for the person using the form

• An input with a description has an ⓘ after its label (the label's text is unchanged; the ⓘ is the label's graphic, on its right).
  • Hover the ⓘ or the label: the description as a tooltip (the label already had it).
  • Click the ⓘ: it stays open until a click elsewhere or Escape.
  • Tab into the input: the description shows under it (JavaFX focusVisible, so a mouse click into the input shows nothing extra).
• An input without a description (none, or only spaces) has no ⓘ.
• Works for every input kind, check boxes included (in QuPath every input has its label in the left column), inputs in folded groups, advanced settings and ChoicesFrom dropdowns.
• The ⓘ has the accessible text "Help: " and the description as accessible help.

Files

• LcHelp.groovy (new part, listed in parts.txt): the marker, the kept-open popup, the keyboard-focus tooltip.
• LabConstrictorTools.groovy: addRows calls LcHelp.mark for each row (replacing the old label-only tooltip); a helpMarkers map, cleared with the form.
• tests/gui_test_help_body.groovy (new) + its apps in tests/run_gui_ci.sh: markers and hover text on Find bright spots, a click keeps it open, Tab through the form shows each input's help, programmatic (mouse-like) focus does not, folded group and ChoicesFrom (Show a shape), no marker on Delayed points (runs app, no descriptions), blank description = none.
• README.md: one bullet.

Checked locally (Windows 11)

• The joined script (parts.txt order) plus the new test body compiles with QuPath 0.7.0's own Groovy 5.0.4 (FileSystemCompiler, against QuPath's jars).
• npm-groovy-lint (the cached 17.x; CI pins 18.0.0) with .groovylintrc.json, --failon info: 0 findings.
• Not run locally: the GUI test bodies (Linux + Xvfb only); the new body runs for the first time in this PR's CI.

After this merges, the QuPath column of the Input help marker row in Tools docs/HOST_FEATURES.md can move from "planned" to done.

🤖 Generated with Claude Code