[wp-trac] [WordPress Trac] #26642: [caption] is 10px too wide

[WordPress Trac]

#26642: [caption] is 10px too wide
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 Reporter:  Looimaster    |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  3.8
 Severity:  normal        |   Keywords:
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 In /wp-includes/media.php in `img_caption_shortcode()` there is a note
 saying `By default, the caption is 10 pixels greater than the width of the
 image, to prevent post content from running up against a floated image.`

 but this makes the caption text misaligned (too long) 10px in all the
 possible cases:
 - image floating left
 - image floating right
 - image centered
 - image with `alignnone`

 Caption text is longer than the image. Not exactly below the image.

 Furthermore, if an image without caption (for example 150px wide) is
 placed below/above the image with caption (150px converted to 160px) and
 both are left aligned then it forms a misaligned grid (all images with
 captions push the text 10px to the right).

 When I remove this 10px increment, everything looks exactly like expected.
 Post content doesn't run onto the image or caption in any case and I
 tested them all. I'm wondering if this 10px increment should be there?
 What does it do? Maybe that's a bug?

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Ticket URL: <http://core.trac.wordpress.org/ticket/26642>
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