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fix(file-picker): prevent double-click crash during refresh - #349
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Summary
Fixes #348.
Prevent Textual's mouse text-selection path from starting on file-picker entry labels. A rapid second click can arrive after directory navigation has detached the previous row, causing
Screen._forward_event()to dereference a missing parent and crash withAttributeError: 'NoneType' object has no attribute 'region'.The file-picker rows remain clickable for directory navigation; keyboard navigation is unchanged.
Testing
pytest -q tests/ui: 417 passed.Related upstream Textual report: Textual issue #6643; proposed upstream fix: Textual PR #6645.