TQTextEdit: add missing mightStartDrag initialization

mightStartDrag might have been used uninitialized when moving mouse with
pressed mouse button into window.

Signed-off-by: Alexander Golubev <fatzer2@gmail.com>
(cherry picked from commit 2b1c78cb53)

src/widgets/qtextedit.cpp

@@ -968,6 +968,7 @@ void TQTextEdit::init()
     wrapMode = WidgetWidth;
     wrapWidth = -1;
     wPolicy = AtWhiteSpace;
+    mightStartDrag = FALSE;
     inDnD = FALSE;
     doc->setFormatter( new TQTextFormatterBreakWords );
     doc->formatCollection()->defaultFormat()->setFont( TQScrollView::font() );