Tabs with modifiers are passed up from chat boxes.

In Qt chat boxes filter out events related to text editing, including tabs.
Unfortunately tabs with modifiers like those used to cycle through contacts are
being filtered despite not being used for anything.

This fixes the keybind for cycling forward through contacts (Ctrl+Tab).

src/widget/tool/chattextedit.cpp

@@ -25,12 +25,17 @@ ChatTextEdit::ChatTextEdit(QWidget *parent) :
 }
 
 void ChatTextEdit::keyPressEvent(QKeyEvent * event)
-{    
+{
     int key = event->key();
     if ((key == Qt::Key_Enter || key == Qt::Key_Return) && !(event->modifiers() & Qt::ShiftModifier))
         emit enterPressed();
     else if (key == Qt::Key_Tab)
-        emit tabPressed();
+    {
+        if (event->modifiers())
+            event->ignore();
+        else
+            emit tabPressed();
+    }
     else if (key == Qt::Key_Up && this->toPlainText().isEmpty())
     {
         this->setText(lastMessage);