fix discover timeline crash

[Tlaster]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes crashes when a timeline loader is not supported by introducing a NotSupported state and handling it gracefully in the presenter.

• Introduces a NotSupported case in BaseTimelineLoader and returns an empty PagingData with error states.
• Updates discoverStatuses() exception message in XQTDataSource to reference XQT.
• Removes the debug catch { printStackTrace() } and adds upstream error handling in TimelinePresenter.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
TimelinePresenter.kt	Wraps loader in a .catch that emits NotSupported, handles it by emitting an empty paging stream, and removes the old debug catch.
XQTDataSource.kt	Changes the unsupported operation exception message to "XQT does not support discover statuses".
BaseRemoteMediator.kt	Converts BaseTimelineLoader into a sealed interface with a data object NotSupported variant.

[Copilot]

Using flowOf(...) produces a finite flow that emits once and then completes. When combined with filterFlow, the overall stream will complete early and stop responding to further filter updates. Consider returning a non-terminating flow (e.g., mapping filterFlow to PagingData.empty(...)) or restructuring so the combined flow continues emitting on filter changes.

Suggested change

	flowOf(
	filterFlow.map {

[Copilot]

The data object syntax for NotSupported is experimental in Kotlin 1.9 and requires opt-in to ExperimentalStdlibApi. Please add @OptIn(ExperimentalStdlibApi::class) or replace with a regular object to avoid relying on experimental features.

Suggested change

	data object NotSupported : BaseTimelineLoader
	object NotSupported : BaseTimelineLoader

[Copilot]

Catching all exceptions on loader and emitting NotSupported may hide real errors. Consider catching only specific exception types (e.g., UnsupportedOperationException) or at least logging unexpected exceptions to avoid masking other failures.

Suggested change

	.catch {
	emit(BaseTimelineLoader.NotSupported)
	.catch { exception ->
	when (exception) {
	is UnsupportedOperationException -> emit(BaseTimelineLoader.NotSupported)
	else -> {
	println("Unexpected error in loader: ${exception.message}")
	throw exception
	}
	}