long strike through messages don't wrap

If I go to a site such as https://qwerty.dev/strikethrough-generator/ and generate a segment of text, then copy and paste that message into an element room, it cuts off whatever doesn't fit.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to https://qwerty.dev/strikethrough-generator/
2. Generate text long enough to need to wrap
3. Paste to room
4. See error

**Expected behavior**
Strike through text should wrap just like normal text, by splitting on spaces

**Screenshots**

**Smartphone (please complete the following information):**
- Device: Moto x 4
- OS: Android 9

**Additional context**
- App version and store: google play store version 1.1.0
- Homeserver: [e.g. matrix.org]

Add any other context about the problem here.