MPV: Get ride of last text in the play/pause button and should close MPV properly

src/UI/DocumentViews/MpvContainer.cc

@@ -65,6 +65,7 @@ MpvContainer::closeMpv() noexcept
 {
     if (mpv) {
         qDebug() << "Closing the MPV context";
+        asyncCommand(AsyncCmdType::None, { "quit", nullptr });
         registerMpvTimeCallback(nullptr);
         registerMpvDurationCallback(nullptr);
         mpv_handle *tmp_mpv = mpv;

src/UI/DocumentViews/MpvControls.cc

@@ -12,7 +12,7 @@ MpvControls::MpvControls(MpvContainer *passedContainer, QWidget *parent) noexcep
     , mpv(passedContainer)
 {
     auto *progressBar          = new QSlider(this);
-    auto *togglePlaybackButton = new QPushButton("Pause", this); // Be default MPV is paused
+    auto *togglePlaybackButton = new QPushButton(playIcon, "", this); // Be default MPV is paused
 
     progressBar->setTracking(false);
     progressBar->setOrientation(Qt::Horizontal);