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media_buttons_context

Filters the legacy (pre-3.5.0) media buttons.

admin_head_{$content_func}

Fires in the admin header for each specific form tab in the legacy (pre-3.5.0) media upload popup.

admin_head-media-upload-popup

Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) media upload popup are printed.

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disable_captions

This filter is documented in wp-admin/includes/media.php

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image_send_to_editor

Filters the image HTML markup to send to the editor when inserting an image.

media_upload_tabs

This filter is documented in wp-admin/includes/media.php

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load_image_to_edit

Filters the current image being loaded for editing.