[Qt] Ensure text margins in current time display are zero

Some Qt themes, namely Adwaita, mess with QLineEdit text margins after the
size of the widget has been calculated, squeezing content partially out of
view of a fixed size. Reset margins back to zero behind their back.

avidemux/qt4/ADM_UIs/src/DIA_flyDialog.cpp

@@ -260,6 +260,9 @@ bool        ADM_flyDialog::addControl(QHBoxLayout *horizontalLayout_4)
 {
         _parent->setSizePolicy(QSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum));
         _control=new flyControl(horizontalLayout_4);
+        _parent->adjustSize(); // force currentTime size calculation
+        _control->currentTime->setTextMargins(0,0,0,0); // counteract Adwaita messing with text margins
+
         QObject::connect(_control->pushButton_next ,SIGNAL(clicked()),this,SLOT(nextImage()));
         QObject::connect(_control->pushButton_back1mn ,SIGNAL(clicked()),this,SLOT(backOneMinute()));
         QObject::connect(_control->pushButton_fwd1mn ,SIGNAL(clicked()),this,SLOT(fwdOneMinute()));

avidemux/qt4/ADM_userInterfaces/ADM_gui/Q_gui2.cpp

@@ -550,6 +550,7 @@ MainWindow::MainWindow(const vector<IScriptEngine*>& scriptEngines) : _scriptEng
     widgetsUpdateTooltips();
 
     this->adjustSize();
+    ui.currentTime->setTextMargins(0,0,0,0); // some Qt themes mess with text margins
 
     threshold = RESIZE_THRESHOLD;
     actZoomCalled = false;