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Use png icons in caldav reminder emails #23915
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Use png icons in caldav reminder emails #23915
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Signed-off-by: Richard Steinmetz <richard@steinmetz.cloud>
| This fixes the svg icon issue we discussed the other day. | 
| comments integration tests and missing JS assets are both fixed on master in the meantime -> merge | 
| @ChristophWurst @eneiluj Should we backport this? | 
| /backport to stable20 | 
| /backport to stable19 | 
| /backport to stable18 | 
| As of 20.0.8 it looks like the calendar event invite emails are still using svgs instead of pngs (e.g.  | 

CalDAV reminder notification emails still contain svg icons which won't be displayed by some email clients. The icons in most activity notification emails were replaced with pngs (#5483).
All new png icons were converted using inkscape and optimized using
build/image-optimization.sh.See https://css-tricks.com/a-guide-on-svg-support-in-email/ for a list of email clients which do not support svgs.
Feedback is appreciated.