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original commit: d6be7e535cd675167c18f7bb8a5e7f2a2f239218
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@ -147,9 +147,7 @@
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(λ ()
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(split (get-horizontal%)))]
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(public collapse)
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(define collapse
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(λ ()
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(define/public (collapse)
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(let ([canvas (send (send parent get-top-level-window) get-edit-target-window)]
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[ec% (get-editor-canvas%)])
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(when (and canvas
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@ -161,7 +159,7 @@
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(let* ([sp (send p get-parent)]
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[p-to-remain (send sp get-parent)])
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(send p-to-remain change-children (λ (x) null))
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(send (make-object ec% p-to-remain editor) focus))))))))
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(send (make-object ec% p-to-remain editor) focus)))))))
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(super-instantiate () (parent parent))
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