ui: do not notify entire dataset when adding log items

Signed-off-by: Jason A. Donenfeld <[email protected]>

Author: zx2c4

ui/src/main/java/com/wireguard/android/activity/LogViewerActivity.kt

@@ -198,19 +198,18 @@ class LogViewerActivity : AppCompatActivity() {
                         recyclerView?.let {
                             val shouldScroll = haveScrolled && !it.canScrollVertically(1)
                             logLines.add(logLine)
-                            if (haveScrolled) logAdapter.notifyDataSetChanged()
+                            if (haveScrolled) logAdapter.notifyItemInserted(logLines.size - 1)
                             if (shouldScroll)
                                 it.scrollToPosition(logLines.size - 1)
                         }
                     } else {
                         logLines.lastOrNull()?.msg += "\n$line"
-                        if (haveScrolled) logAdapter.notifyDataSetChanged()
+                        if (haveScrolled) logAdapter.notifyItemChanged(logLines.size - 1)
                     }
                     if (!haveScrolled) {
                         val end = System.nanoTime()
                         val scroll = (end - start) > 1000000000L * 2.5 || !stdout.ready()
                         if (logLines.isNotEmpty() && (scroll || (end - startPeriod) > 1000000000L / 4)) {
-                            logAdapter.notifyDataSetChanged()
                             recyclerView?.scrollToPosition(logLines.size - 1)
                             startPeriod = end
                         }