Fetch and display image thumbnails in the timeline instead of the full-resolution image

[aaravlu]

issue #271

To-do before merge:

• Fetch thumbnail instead full origin media.

[aaravlu]

before:

after:

It's easy to see clarity difference of the image on my machine.

If you can alse see the difference, that's great!

[aaravlu]

@kevinaboos
Thanks for noticing this comment.
I have finished the task1 while there is no need to review this time.
Now I am working on task2, which shoud make the image clickable as first step.
I change View to ClickableView here:

robrix/src/shared/text_or_image.rs

Line 40 in 905bc2d

image_view = <ClickableView> {

There are a few of points confusing me:

• There is no any widgets in robrix rely on ClickableView in shared/clickable_view.rs.
• I have tested ClickableView for many times and seems it cannot work. And One widget called RoomPreview, which is a View, impl the clickable function itself instead relying on ClickableView:

  robrix/src/home/room_preview.rs

  Line 173 in 905bc2d

  match event.hits(cx, self.view.area()) {

[kevinaboos]

@kevinaboos Thanks for noticing this comment. I have finished the task1 while there is no need to review this time. Now I am working on task2, which shoud make the image clickable as first step. I change View to ClickableView here:

Let's keep this PR simple and focused on just one thing -- the thumbnail support, which you've called "task1". We can handle task2 later in a separate PR, as it is easier to review multiple smaller PRs instead of one big PR.

So, please address my one comment, and clean up this PR such that it only includes changes related to thumbnails.

There are a few of points confusing me:

• There is no any widgets in robrix rely on ClickableView in shared/clickable_view.rs.
• I have tested ClickableView for many times and seems it cannot work. And One widget called RoomPreview, which is a View, impl the clickable function itself instead relying on ClickableView

Ah yes, ClickableView is no longer used and should be removed. Please don't use that for task2. We'll remove that code.

[kevinaboos]

Thanks, the new code to fetch the thumbnail or the full-size image as a fallback looks good now.

Please remove all ImageViewer stuff from this PR so I can merge in only the thumbnail-related changes. You can add the ImageViewer back in as part of a future PR.

[alanpoon]

I am using commit 50f662a

It does not seem to be fetching thumbnails in the timeline.

Expected