Fix warning 'warning:
Undefined global variable '
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@ -375,7 +375,7 @@ class Template_Previewer {
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// Fix to issue on wp_get_attachment_url() inside core.
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// Fix to issue on wp_get_attachment_url() inside core.
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// @todo report it.
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// @todo report it.
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$initial_pagenow = $GLOBALS['pagenow'];
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$initial_pagenow = $GLOBALS['pagenow'] ?? '';
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$GLOBALS['pagenow'] = '';
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$GLOBALS['pagenow'] = '';
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$default_settings = array(
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$default_settings = array(
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