Signal-android: Trying to use large emoji as image stickers in the image editor doesn't work

[inthewaves]

• [x] I have searched open and closed issues for duplicates
• [x] I am submitting a bug report for existing functionality that does not work as intended
• [x] I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
• [x] This isn't a feature request or a discussion topic

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Bug description

Trying to use large emoji as image stickers doesn't work.
It seems like it affects Android 7 and up. An Android 6.0.1 device doesn't have this issue.

Steps to reproduce

• Select an image to send to a contact
• Use the text option in the image editor to insert an emoji and stretch it out large like it is a sticker
• Send the image

Actual result: The emoji disappears from the image after it is sent
Expected result: The emoji stays on the image exactly as it appeared in the editor

[alan-signal]

Thanks for report.

Seems to be a general android rendering bug:

https://stackoverflow.com/questions/50965784/canvas-drawtext-doesnt-render-large-emojis-on-android

https://bugs.chromium.org/p/chromium/issues/detail?id=501071

Weirdly, at some even large scales I have seen the emoji come back.

And when they disappear after send, that is because the final render can be at a larger resolution than the editor, which means a font size that was under limit in preview, can be over limit in final render.

[greyson-signal]

Given the nature of the bug, there probably isn't much we can do about it.