Fix selection clearing not working in Reply window (#4218)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/splits/Split.cpp

@@ -115,6 +115,7 @@ Split::Split(QWidget *parent)
     });
     this->updateInputPlaceholder();
 
+    // clear SplitInput selection when selecting in ChannelView
     this->view_->selectionChanged.connect([this]() {
         if (this->input_->hasSelection())
         {
@@ -122,6 +123,14 @@ Split::Split(QWidget *parent)
         }
     });
 
+    // clear ChannelView selection when selecting in SplitInput
+    this->input_->selectionChanged.connect([this]() {
+        if (this->view_->hasSelection())
+        {
+            this->view_->clearSelection();
+        }
+    });
+
     this->view_->openChannelIn.connect([this](
                                            QString twitchChannel,
                                            FromTwitchLinkOpenChannelIn openIn) {