Fixes a conflict between "Safe SVG" and "Enable Media Replace" when replacing existing media files with SVG uploads.

jgorres

Problem:
With “Safe SVG” alone, uploading SVG files into the WordPress Media Library works fine. As soon as you try to replace an existing file with an SVG via the “Enable Media Replace” plugin, the operation aborts with the message “Sorry, this file type is not permitted for security reasons.”.
Root cause: EMR calls <code>wp_check_filetype_and_ext()</code> directly from its own submenu (<code>upload.php?page=enable-media-replace/...</code>) without going through the standard upload path (<code>wp_handle_upload</code>). Safe SVG, however, registers its MIME-type fix only on certain admin page hooks — and those do not reliably fire on the EMR replace page in practice.
Solution:
This plugin registers the two required filters (<code>upload_mimes</code>, <code>wp_check_filetype_and_ext</code>) globally so that SVG uploads work through EMR as well.
Safety guard:
So that this plugin does not open an unsanitized SVG upload path, the filters are active only when the “Safe SVG” plugin itself is active. Safe SVG then handles the SVG sanitization on <code>wp_handle_upload_prefilter</code> / <code>wp_handle_sideload_prefilter</code>. Without an active Safe SVG, SVG remains non-uploadable.

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