Fix voice record button infinite animation

Enabling animations triggers an animation of the voice record button
that keeps firing uselessly at ~120 calls per second until the button
is manually toggled. The animation callback cannot stop itself since
it expects the button to be visible.

This commit fixes the issue by preventing spawning the animation if
the widget is hidden.

Telegram/SourceFiles/history/view/controls/history_view_voice_record_button.cpp

@@ -87,7 +87,7 @@ void VoiceRecordButton::init() {
 			_blobs->setLevel(0.);
 		}
 		_blobsHideLastTime = hide ? crl::now() : 0;
-		if (!hide && !_animation.animating()) {
+		if (!hide && !_animation.animating() && isVisible()) {
 			_animation.start();
 		}
 	}, lifetime());