Stickers in sticker picker aren't cached

[Bubu]

Describe the bug
The stickers (well, I guess images) displayed in the sticker picker aren't cached. Which leads to element android not shwoing any stickers on bad/missing internet connection. And I guess it's redownloading about 10MB of sticker data whenever I want to sent a sticker.

This is using https://github.com/maunium/stickerpicker as a stickerpicker

To Reproduce
Steps to reproduce the behavior:

1. Have https://github.com/maunium/stickerpicker as a stickerpicker
2. Open the stickerpicker, wait for all previews to be downloaded
3. close element android
4. open stickerpicker again and wait for everything to download again

Expected behavior
I expected that the stickerpicker widget itself and the sticker preview data is cached

Smartphone (please complete the following information):

• Device: Nexus 5X
• OS: Android 8.1

Additional context

• App version 1.0.5-F-Droid
• Homeserver: bubu1.eu

[Bubu]

Mmmh, maybe there is some caching. Stickers load faster sometimes. But they definitely don't load at all when you are offline.

[dkanada]

I can confirm there is zero caching. I found the code that disables all caching for widgets and removed it for my personal builds to make stickers viable. Hopefully I'll have a PR to fix that along with a few more sticker issues soon.

[kojid0]

I can confirm there is zero caching. I found the code that disables all caching for widgets and removed it for my personal builds to make stickers viable. Hopefully I'll have a PR to fix that along with a few more sticker issues soon.

Thank you!

[bmarty]

Done in #2648 (Element Android 1.2.1)