Modify the internal rectangle drawing of CE_RubberBand

adjusted(1, 1, -2, -2) makes the rectangle smaller, but when
rect.x1-rect.x2 = 0. Then x1 + 1, x2-2 leads to x1> x2. This will
make the rectangle flip in advance. So there is a difference
between the updated area and the drawn area.

Add a judgment, when the rectangle we get is large enough, draw the inner rectangle.

Fixes: QTBUG-95716
Done-with: Oliver Eftevaag <oliver.eftevaag@qt.io>
Done-with: Volker Hilsheimer <volker.hilsheimer@qt.io>
Change-Id: I0d081a4ad7aee4a563acb988c0ef19a646bf1eea
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 77bdce84965662a67162d1272245b168c96875db)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/src/widgets/styles/qfusionstyle.cpp b/src/widgets/styles/qfusionstyle.cpp
index 5772c7d4c4..0a09526701 100644
--- a/src/widgets/styles/qfusionstyle.cpp
+++ b/src/widgets/styles/qfusionstyle.cpp
@@ -1099,10 +1099,13 @@ void QFusionStyle::drawControl(ControlElement element, const QStyleOption *optio
             painter->translate(0.5, 0.5);
             painter->setBrush(dimHighlight);
             painter->drawRoundedRect(option->rect.adjusted(0, 0, -1, -1), 1, 1);
-            QColor innerLine = Qt::white;
-            innerLine.setAlpha(40);
-            painter->setPen(innerLine);
-            painter->drawRoundedRect(option->rect.adjusted(1, 1, -2, -2), 1, 1);
+            //when the rectangle we get is large enough, draw the inner rectangle.
+            if (option->rect.width() > 2 && option->rect.height() > 2) {
+                QColor innerLine = Qt::white;
+                innerLine.setAlpha(40);
+                painter->setPen(innerLine);
+                painter->drawRoundedRect(option->rect.adjusted(1, 1, -2, -2), 1, 1);
+            }
             painter->restore();
         }
         break;