dolphin/kitemlistwidget: Fix full selected state persisting on deselect with non-Breeze QStyles

For non-Breeze QStyles Dolphin is currently drawing the full highlight effect for items even when they are deselected.

The issues is that it treats keyboard focus as the same state as a selected state, resulting in a persisting highlight effect.

This patch adds and extra check to paint `State_Selected` only when `m_selected` is true, thereby fixing the problem.

**TEST PLAN**

Tested with Oxygen, Fusion, Kvantum, Darkly, MS Windows 9x.
- all of the styles had the issue with the full selected state persisting on mouse deselect
- after this change all of the styles lost the full selected state and retained only their keyboard focus state

**SCREENSHOTS**

Before (MS Windows 9x):

![2026-03-29_21-42-03](/uploads/b369a63acb817a2b79e769a7c99a0378/2026-03-29_21-42-03.mp4)

After (MS Windows 9x):

![2026-03-29_21-40-54](/uploads/b65230529dee7b552d58a1139353eca9/2026-03-29_21-40-54.mp4)

1 files changed, 7 insertions, 2 deletions

diff --git a/src/kitemviews/kitemlistwidget.cpp b/src/kitemviews/kitemlistwidget.cpp
index 7d43a0c14..b94cf6064 100644
--- a/src/kitemviews/kitemlistwidget.cpp
+++ b/src/kitemviews/kitemlistwidget.cpp
@@ -121,9 +121,13 @@ void KItemListWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *o
         painter->fillRect(backgroundRect, backgroundColor);
     }
 
+    const QStyle::State selectedState(m_selected ? QStyle::State_Selected : QStyle::State(0));
     if ((m_selected || m_current) && m_editedRole.isEmpty()) {
         const QStyle::State activeState(isActiveWindow() && widget->hasFocus() ? QStyle::State_Active : 0);
-        drawItemStyleOption(painter, widget, activeState | QStyle::State_Enabled | QStyle::State_Selected | QStyle::State_Item);
+        // Only pass State_Selected when the item is actually selected, not just when
+        // it has keyboard focus (m_current), to avoid styles drawing a persistent
+        // selection highlight on focused but unselected items.
+        drawItemStyleOption(painter, widget, activeState | selectedState | QStyle::State_Enabled | QStyle::State_Item);
     }
 
     if (m_hoverOpacity > 0.0) {
@@ -135,7 +139,7 @@ void KItemListWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *o
 
             QPainter pixmapPainter(m_hoverCache);
             const QStyle::State activeState(isActiveWindow() && widget->hasFocus() ? QStyle::State_Active | QStyle::State_Enabled : 0);
-            drawItemStyleOption(&pixmapPainter, widget, activeState | QStyle::State_MouseOver | QStyle::State_Item);
+            drawItemStyleOption(&pixmapPainter, widget, activeState | selectedState | QStyle::State_MouseOver | QStyle::State_Item);
         }
 
         const qreal opacity = painter->opacity();
@@ -231,6 +235,7 @@ void KItemListWidget::setSelected(bool selected)
             m_selectionToggle->setChecked(selected);
         }
         selectedChanged(selected);
+        clearHoverCache();
         update();
     }
 }