Compile output: Do not do scroll wheel zooming

That was the behavior before the fix for QTBUG-30845 (which introduced
scroll wheel zooming for read-only QPlainTextEdit).

Change-Id: I216ed6c827d8dc966af3af67158e9c275c9fa949
Task-number: QTCREATORBUG-11017
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>

src/plugins/projectexplorer/compileoutputwindow.cpp

@@ -87,6 +87,13 @@ private slots:
     }
 
 protected:
+    void wheelEvent(QWheelEvent *ev)
+    {
+        // from QPlainTextEdit, but without scroll wheel zooming
+        QAbstractScrollArea::wheelEvent(ev);
+        updateMicroFocus();
+    }
+
     void mouseDoubleClickEvent(QMouseEvent *ev)
     {
         int line = cursorForPosition(ev->pos()).block().blockNumber();