fix(shot): suppress XRecord relay on normal path to fix selection flicker on HiDPI

The XRecord relay introduced in BUG-330895 uses coordinate comparison
(m_currentCursor vs rootX/rootY) to deduplicate events when Qt already
handled them via the native path. However on HiDPI screens the two
coordinates live in different spaces — mouseEvent->pos() is a widget-local
logical coordinate scaled by pixelRatio, while rootX/rootY are physical
screen pixels — so the comparison always evaluates to unequal. Every mouse
move during drag triggers two repaint() calls (one from Qt native, one from
XRecord relay), causing the dashed selection border to flicker.

Replace the coordinate-based dedup with a timestamp approach:
- mouseMoveEF records m_lastNativeMouseMoveMs on every native MouseMove
  (relayed events are gated by m_isRelayedEvent flag to avoid polluting)
- onMouseDrag/onMouseMove only relay when no native event arrived in >50ms

At ~60fps, native events land every ~16ms, so the 50ms threshold
completely suppresses relay under normal operation. When a Dock Grab
blocks Qt input, the gap exceeds 50ms and relay kicks in automatically.

Log: 修复高分屏截图框选虚线闪烁问题

PMS: BUG-330895

Influence: 高分屏拖拽框选不再闪烁；Dock Grab 场景下 XRecord 补发仍正常工作

Author: dengzhongyuan365-dev

src/main_window.cpp

@@ -629,8 +629,10 @@ void MainWindow::refetchWindowInfo()
 void MainWindow::sendSimulatedMouseEvent(QEvent::Type type, const QPoint &pos,
                                          Qt::MouseButton button, Qt::MouseButtons buttons)
 {
+    m_isRelayedEvent = true;
     QScopedPointer<QMouseEvent> event(new QMouseEvent(type, pos, button, buttons, Qt::NoModifier));
     QApplication::sendEvent(this, event.data());
+    m_isRelayedEvent = false;
 }
 
 void MainWindow::forceX11WindowPosition()
@@ -5297,6 +5299,10 @@ int MainWindow::mouseMoveEF(QMouseEvent *mouseEvent, bool &needRepaint)
     // qCDebug(dsrApp) << "mouseEvent->pos()" << mouseEvent->pos() << " , isFirsMove: " << isFirstMove;
     // 当前光标的位置
     m_currentCursor = mouseEvent->pos();
+    // 仅原生事件更新时间戳，转发事件不更新（避免污染判断）
+    if (!m_isRelayedEvent) {
+        m_lastNativeMouseMoveMs = QDateTime::currentMSecsSinceEpoch();
+    }
     // 没打开截图的编辑模式
     if (!m_isShapesWidgetExist) {
         if (m_toolBar && m_toolBar->isVisible()) {
@@ -6037,13 +6043,12 @@ void MainWindow::onMouseDrag(int x, int y)
         showDragFeedback(x, y);
     }
 
-    // 截图模式：拖拽阶段（按下左键后移动）XRecord 发出 mouseDrag 而非 mouseMove。
-    // Dock Grab 存在时 Qt event filter 收不到拖拽移动事件，框选区域无法更新。
-    // 同样用坐标去重避免正常情况下双重触发。
+    // 截图模式：拖拽阶段 XRecord 补发鼠标移动事件。
+    // 仅当 Qt 原生事件通路被阻断（Dock Grab）超过 50ms 未收到 MouseMove 时才转发，
+    // 正常操作下 Qt 事件每 ~16ms 到达一次，转发被完全抑制，避免双重 repaint。
     if (status::shot == m_functionType && isFirstPressButton && !isFirstReleaseButton) {
-        QPoint pos(x, y);
-        if (m_currentCursor != pos) {
-            sendSimulatedMouseEvent(QEvent::MouseMove, pos, Qt::NoButton, Qt::LeftButton);
+        if (QDateTime::currentMSecsSinceEpoch() - m_lastNativeMouseMoveMs > 50) {
+            sendSimulatedMouseEvent(QEvent::MouseMove, QPoint(x, y), Qt::NoButton, Qt::LeftButton);
         }
     }
 }
@@ -6103,17 +6108,14 @@ void MainWindow::onMouseMove(int x, int y)
         }
     }
 
-    // 截图悬停阶段（未开始框选）通过 XRecord 持续补发鼠标移动事件。
-    // Dock Grab 存在时 Qt 正常事件通路被阻断，XRecord 在协议层拦截不受影响。
+    // 截图悬停阶段（未开始框选）通过 XRecord 补发鼠标移动事件。
     // 拖拽阶段由 onMouseDrag 负责补发，此处只覆盖悬停阶段（!isFirstPressButton）。
     // 非截图模式保持原有逻辑：仅补发第一次（!isFirstMove）。
-    // m_currentCursor 在 mouseMoveEF 开头被更新：坐标已匹配说明 Qt 正常处理过，
-    // 无需重复补发，避免正常情况下双重触发。
+    // 仅当 Qt 原生事件通路被阻断超过 50ms 时才转发。
     bool inShotHoverPhase = status::shot == m_functionType && !isFirstPressButton;
     if (!isFirstMove || inShotHoverPhase) {
-        QPoint pos(x, y);
-        if (m_currentCursor != pos) {
-            sendSimulatedMouseEvent(QEvent::MouseMove, pos, Qt::NoButton, Qt::NoButton);
+        if (QDateTime::currentMSecsSinceEpoch() - m_lastNativeMouseMoveMs > 50) {
+            sendSimulatedMouseEvent(QEvent::MouseMove, QPoint(x, y), Qt::NoButton, Qt::NoButton);
         }
     }
 }

src/main_window.h

@@ -1438,7 +1438,9 @@ public slots:
     /**
      * @brief 当前光标的位置
      */
-    QPoint m_currentCursor;  
+    QPoint m_currentCursor;
+    bool m_isRelayedEvent = false;
+    qint64 m_lastNativeMouseMoveMs = 0;
     // ---------------------- treeland--------------------------------
 
     /**