Defect #44442
open
Large blank space before pre blocks in HTML email notifications
Description
When an issue description or note contains a pre block, HTML email notifications show a large blank space above the block. This was confirmed with Thunderbird. Other mail clients that keep <svg> elements are likely affected as well.
The cause is the copy button that CopypreScrubber adds to every pre block since r24360 (#43643). The button contains an SVG sprite icon, and the mailer layout has no CSS for it. Mail clients cannot render the icon because <use> references an external sprite, so only an empty <svg> element is left, and it is rendered as a 300x150px blank box. This is the default size of an <svg> element without width and height in an HTML document (see "Sizing SVG content in CSS context"https://svgwg.org/specs/integration/#svg-css-sizing).
The attached patch adds svg { display: none; } to the mailer layout so that all SVG sprite icons are hidden in email notifications, and replaces the alert-specific rule added in #43420 with it.
Files
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