[Bug] The reminder of max input length is not reliable in mask compose when using image payload with plugins

[AinuX]

Bug Info

How to reproduce?

1. Post ITO or RedPacket in image payload mode.
2. Notice the reminder of input length.
3. Reach the max length.

What happened?

Will cause the image payload can't be decrypted.

What should happen?

Environment

Mask Version:

• [x] (Browser) Installed from the extension store (version: )
• [ ] (App) Installed from the app store (version: )
• [ ] master branch
• [ ] Build of version/commit hash:

(Please write down build command/flags if there is anything special)

System

• [ ] Windows 10
• [x] Mac OS X Catalina
• [ ] Linux:

Platform/Browser

• [x] Latest Chrome (stable channel)
• [ ] Latest Firefox (stable channel)
• [ ] Android 11
• [ ] iOS 14

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.