Improve handling of SVG image attachments and WYSIWYG attachment previews #7721
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Fixes #7719 by showing SVG attachments as images.
The fiddliest part was handling thumbnails. SVG images don't need thumbnails for obvious reasons, but SMF assumes that images do need them. So I had to add some special handling for SVGs to tell SMF that the SVG image is its own thumbnail, and then slightly tweak the JavaScript used to expand thumbnails when the user clicks on them.
Fixes #7720 by showing original images for embedded attachments in WYSIWYG editor.
The basic task of switching from thumbnails to original images merely required changing
thumb
toimage
on the relevant line in jquery.sceditor.smf.js. However, to prevent the download counter from incrementing unexpectedly, I also had to resurrect thepreview
URL parameter in ShowAttachment.php as a way to tell SMF that this shouldn't count as a download.