Fix word backspacing not closing/updating colon emote picker (#2781)

Co-authored-by: Paweł <zneix@zneix.eu>

src/widgets/splits/SplitInput.cpp

@@ -86,6 +86,8 @@ void SplitInput::initLayout()
         app->fonts->getFont(FontStyle::ChatMedium, this->scale()));
     QObject::connect(this->ui_.textEdit, &QTextEdit::cursorPositionChanged,
                      this, &SplitInput::onCursorPositionChanged);
+    QObject::connect(this->ui_.textEdit, &QTextEdit::textChanged, this,
+                     &SplitInput::onTextChanged);
 
     this->managedConnections_.push_back(app->fonts->fontChanged.connect([=]() {
         this->ui_.textEdit->setFont(
@@ -447,6 +449,11 @@ void SplitInput::installKeyPressedEvent()
     });
 }
 
+void SplitInput::onTextChanged()
+{
+    this->updateColonMenu();
+}
+
 void SplitInput::onCursorPositionChanged()
 {
     this->updateColonMenu();