The transitive-include scan in _merge_arduino_libs_to_component used
glob('*.h') on the component dir, which only finds headers at the root.
Libraries with a src/ layout (GxEPD2, ArduinoJson, most modern Arduino
libs) keep their headers under src/<...>, so the scan saw zero headers
and never queued their transitive deps.
Symptom: compiling a sketch that includes GxEPD2_3C.h failed with
'Adafruit_GFX.h: No such file or directory' even though Adafruit_GFX
was installed via the Library Manager — because the BFS never reached
its header from inside GxEPD2_GFX.h.
Switching to rglob('*.h') walks the full directory tree and lets the
BFS pick up Adafruit_GFX, Adafruit_BusIO, and any other transitive
dependency that lives under src/.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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