fix: eliminate window flickering and Sketcher icon clipping

- Replace statusBar()->setStyleSheet() with QPalette color changes
  in MainWindow::showStatus() and clearStatus(). The setStyleSheet()
  call triggered full style recalculation on every status message
  (selection, pan, tooltip hover), causing the entire window to flicker.

- Add min-height: 24px to QListView::item in KindredCreate.qss so
  Sketcher constraint and element icons (24x24) are not clipped by
  the 4px padding.

src/Gui/MainWindow.cpp

@@ -2541,10 +2541,18 @@ void MainWindow::changeEvent(QEvent* e)
     }
 }
 
+static void setStatusBarForeground(QStatusBar* bar, const QColor& color)
+{
+    QPalette pal = bar->palette();
+    pal.setColor(QPalette::WindowText, color);
+    bar->setPalette(pal);
+}
+
 void MainWindow::clearStatus()
 {
     d->currentStatusType = 100;
-    statusBar()->setStyleSheet(QStringLiteral("#statusBar{}"));
+    // Reset to default foreground from the stylesheet/theme
+    statusBar()->setPalette(QPalette());
 }
 
 void MainWindow::statusMessageChanged()
@@ -2607,16 +2615,16 @@ void MainWindow::showStatus(int type, const QString& message)
     QString msg = fm.elidedText(message, Qt::ElideMiddle, this->d->actionLabel->width());
     switch (type) {
         case MainWindow::Err:
-            statusBar()->setStyleSheet(d->status->err);
+            setStatusBarForeground(statusBar(), d->status->err);
             break;
         case MainWindow::Wrn:
-            statusBar()->setStyleSheet(d->status->wrn);
+            setStatusBarForeground(statusBar(), d->status->wrn);
             break;
         case MainWindow::Pane:
-            statusBar()->setStyleSheet(QStringLiteral("#statusBar{}"));
+            statusBar()->setPalette(QPalette());
             break;
         default:
-            statusBar()->setStyleSheet(d->status->msg);
+            setStatusBarForeground(statusBar(), d->status->msg);
             break;
     }
     d->currentStatusType = -type;
@@ -2739,9 +2747,9 @@ void MainWindow::setWindowTitle(const QString& string)
 StatusBarObserver::StatusBarObserver()
     : WindowParameter("OutputWindow")
 {
-    msg = QStringLiteral("#statusBar{color: #000000}");  // black
+    msg = QColor(0, 0, 0);        // black
-    wrn = QStringLiteral("#statusBar{color: #ffaa00}");  // orange
+    wrn = QColor(0xff, 0xaa, 0);  // orange
-    err = QStringLiteral("#statusBar{color: #ff0000}");  // red
+    err = QColor(0xff, 0, 0);     // red
     Base::Console().attachObserver(this);
     getWindowParameter()->Attach(this);
     getWindowParameter()->NotifyAll();
@@ -2756,24 +2764,21 @@ StatusBarObserver::~StatusBarObserver()
 void StatusBarObserver::OnChange(Base::Subject<const char*>& rCaller, const char* sReason)
 {
     ParameterGrp& rclGrp = ((ParameterGrp&)rCaller);
-    auto format = QStringLiteral("#statusBar{color: %1}");
     if (strcmp(sReason, "colorText") == 0) {
         unsigned long col = rclGrp.GetUnsigned(sReason);
-        this->msg = format.arg(Base::Color::fromPackedRGB<QColor>(col).name());
+        this->msg = Base::Color::fromPackedRGB<QColor>(col);
     }
     else if (strcmp(sReason, "colorWarning") == 0) {
         unsigned long col = rclGrp.GetUnsigned(sReason);
-        this->wrn = format.arg(Base::Color::fromPackedRGB<QColor>(col).name());
+        this->wrn = Base::Color::fromPackedRGB<QColor>(col);
     }
     else if (strcmp(sReason, "colorError") == 0) {
         unsigned long col = rclGrp.GetUnsigned(sReason);
-        this->err = format.arg(Base::Color::fromPackedRGB<QColor>(col).name());
+        this->err = Base::Color::fromPackedRGB<QColor>(col);
     }
     else if (strcmp(sReason, "colorCritical") == 0) {
         unsigned long col = rclGrp.GetUnsigned(sReason);
-        this->critical = format.arg(
+        this->critical = QColor((col >> 24) & 0xff, (col >> 16) & 0xff, (col >> 8) & 0xff);
-            QColor((col >> 24) & 0xff, (col >> 16) & 0xff, (col >> 8) & 0xff).name()
-        );
     }
 }
 

src/Gui/MainWindow.h

@@ -438,7 +438,7 @@ public:
     friend class MainWindow;
 
 private:
-    QString msg, wrn, err, critical;
+    QColor msg, wrn, err, critical;
 };
 
 // -------------------------------------------------------------

src/Gui/Stylesheets/KindredCreate.qss

@@ -862,6 +862,7 @@ QListView {
 QListView::item {
     padding: 4px;
     border-radius: 2px;
+    min-height: 24px;
 }
 
 QListView::item:hover {