Fix scrollbar spacing when no scrollbar is visible in dolphin.

Before this commit, Dolphin reserved space for the scrollbar spacing
even when no scrollbar is visible resulting in a ugly gap in the view
when:

1. the theme uses QStyle::SH_ScrollView_FrameOnlyAroundContents and
2. the theme has a positive PM_ScrollView_ScrollBarSpacing.

QtCurve can have both while Oxygen have 1 but not 2.
To reproduce the problem with Oxygen style. Replace the
`width += ....` (which returns -2 or 0 for Oxygen) with `width += 2`.

See more info here:
https://github.com/QtCurve/qtcurve-qt4/issues/9#issuecomment-28630517

CCBUG: 306631
FIXED-IN: 4.11.4
REVIEW: 113902

1 files changed, 4 insertions, 3 deletions

diff --git a/src/kitemviews/kitemlistcontainer.cpp b/src/kitemviews/kitemlistcontainer.cpp
index f2e94b733..cd2fca1e1 100644
--- a/src/kitemviews/kitemlistcontainer.cpp
+++ b/src/kitemviews/kitemlistcontainer.cpp
@@ -338,16 +338,17 @@ void KItemListContainer::updateGeometries()
     int extra = frameWidth() * 2;
     QStyleOption option;
     option.initFrom(this);
+    int scrollbarSpacing = 0;
     if (style()->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents, &option, this)) {
-        extra += style()->pixelMetric(QStyle::PM_ScrollView_ScrollBarSpacing, &option, this);
+        scrollbarSpacing = style()->pixelMetric(QStyle::PM_ScrollView_ScrollBarSpacing, &option, this);
     }
 
     const int widthDec = verticalScrollBar()->isVisible()
-                         ? extra + style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this)
+                         ? extra + scrollbarSpacing + style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this)
                          : extra;
 
     const int heightDec = horizontalScrollBar()->isVisible()
-                          ? extra + style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this)
+                          ? extra + scrollbarSpacing + style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this)
                           : extra;
 
     rect.adjust(0, 0, -widthDec, -heightDec);