Fix page error processing

app/src/main/java/org/koitharu/kotatsu/ui/reader/PageLoader.kt

@@ -30,7 +30,7 @@ class PageLoader : KoinComponent, CoroutineScope, DisposableHandle {
 				return it
 			}
 		}
-		val task = tasks[url]?.takeUnless { it.isCancelled }
+		val task = tasks[url]?.takeUnless { it.isCancelled || (force && it.isCompleted) }
 		return (task ?: loadAsync(url).also { tasks[url] = it }).await()
 	}
 
@@ -55,6 +55,9 @@ class PageLoader : KoinComponent, CoroutineScope, DisposableHandle {
 				checkNotNull(body) {
 					"Null response"
 				}
+				check(response.isSuccessful) {
+					"Invalid response: ${response.code} ${response.message}"
+				}
 				cache.put(url) { out ->
 					body.byteStream().copyTo(out)
 				}

app/src/main/java/org/koitharu/kotatsu/utils/ext/CommonExt.kt

@@ -7,7 +7,7 @@ import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.exceptions.EmptyHistoryException
 import org.koitharu.kotatsu.core.exceptions.UnsupportedFileException
-import java.io.IOException
+import java.net.SocketTimeoutException
 
 inline fun <T, R> T.safe(action: T.() -> R?) = try {
 	this.action()
@@ -38,12 +38,8 @@ fun Throwable.getDisplayMessage(resources: Resources) = when (this) {
 	is UnsupportedOperationException -> resources.getString(R.string.operation_not_supported)
 	is UnsupportedFileException -> resources.getString(R.string.text_file_not_supported)
 	is EmptyHistoryException -> resources.getString(R.string.history_is_empty)
-	is IOException -> resources.getString(R.string.network_error)
-	else -> if (BuildConfig.DEBUG) {
-		message ?: resources.getString(R.string.error_occurred)
-	} else {
-		resources.getString(R.string.error_occurred)
-	}
+	is SocketTimeoutException -> resources.getString(R.string.network_error)
+	else -> message ?: resources.getString(R.string.error_occurred)
 }
 
 inline fun <T> measured(tag: String, block: () -> T): T {