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(-)src/org/eclipse/jface/preference/PreferencePage.java (-1 / +2 lines)
Lines 497-503 Link Here
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		isValid = b;
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		isValid = b;
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		if (oldValue != isValid) {
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		if (oldValue != isValid) {
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			// update container state
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			// update container state
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			getContainer().updateButtons();
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			if (getContainer() != null)
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				getContainer().updateButtons();
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			// update page state
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			// update page state
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			updateApplyButton();
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			updateApplyButton();
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		}
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		}

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