Utils: Better resizing behavior for environment widget

The automatic resizing to contents should happen immediately, not when
coming back to the widget the next time.

Fixes: QTCREATORBUG-26510
Change-Id: I76cafa493b2eadc5115d42badbabe3d4e0a050f6
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/headerviewstretcher.cpp

@@ -53,6 +53,13 @@ void HeaderViewStretcher::stretch()
     HeaderViewStretcher::eventFilter(parent(), &fake);
 }
 
+void HeaderViewStretcher::softStretch()
+{
+    const auto hv = qobject_cast<QHeaderView*>(parent());
+    for (int i = 0; i < hv->count(); ++i)
+        hv->resizeSections(QHeaderView::ResizeToContents);
+}
+
 bool HeaderViewStretcher::eventFilter(QObject *obj, QEvent *ev)
 {
     if (obj == parent()) {