File xembedsniproxy-avoid-ghost-entry.patch of Package plasma5-workspace.openSUSE_Leap_42.1_Update

From: Weng Xuetian <wengxt@gmail.com>
Date: Tue, 09 Feb 2016 02:56:59 +0000
Subject: Check whether there is any BadWindow error before monitor the event
X-Git-Url: http://quickgit.kde.org/?p=plasma-workspace.git&a=commitdiff&h=829158f830555c031755c6d4348e684779264342
---
Check whether there is any BadWindow error before monitor the event

The tray window itself may be destroyed before we start monitor the
event of it. Check the returned error and skip this window if BadWindow
happens.

FIXED-IN: 5.6.0
BUG: 358719
REVIEW: 127014
---


--- a/xembed-sni-proxy/fdoselectionmanager.cpp
+++ b/xembed-sni-proxy/fdoselectionmanager.cpp
@@ -83,7 +83,7 @@
     m_selectionOwner->claim(false);
 }
 
-void FdoSelectionManager::addDamageWatch(xcb_window_t client)
+bool FdoSelectionManager::addDamageWatch(xcb_window_t client)
 {
     qCDebug(SNIPROXY) << "adding damage watch for " << client;
 
@@ -94,15 +94,27 @@
     m_damageWatches[client] = damageId;
     xcb_damage_create(c, damageId, client, XCB_DAMAGE_REPORT_LEVEL_NON_EMPTY);
 
-    QScopedPointer<xcb_get_window_attributes_reply_t, QScopedPointerPodDeleter> attr(xcb_get_window_attributes_reply(c, attribsCookie, Q_NULLPTR));
+    xcb_generic_error_t *error = Q_NULLPTR;
+    QScopedPointer<xcb_get_window_attributes_reply_t, QScopedPointerPodDeleter> attr(xcb_get_window_attributes_reply(c, attribsCookie, &error));
+    QScopedPointer<xcb_generic_error_t, QScopedPointerPodDeleter> getAttrError(error);
     uint32_t events = XCB_EVENT_MASK_STRUCTURE_NOTIFY;
     if (!attr.isNull()) {
         events = events | attr->your_event_mask;
     }
+    // if window is already gone, there is no need to handle it.
+    if (getAttrError && getAttrError->error_code == XCB_WINDOW) {
+        return false;
+    }
     // the event mask will not be removed again. We cannot track whether another component also needs STRUCTURE_NOTIFY (e.g. KWindowSystem).
     // if we would remove the event mask again, other areas will break.
-    xcb_change_window_attributes(c, client, XCB_CW_EVENT_MASK, &events);
-
+    const auto changeAttrCookie = xcb_change_window_attributes_checked(c, client, XCB_CW_EVENT_MASK, &events);
+    QScopedPointer<xcb_generic_error_t, QScopedPointerPodDeleter> changeAttrError(xcb_request_check(c, changeAttrCookie));
+    // if window is gone by this point, it will be catched by eventFilter, so no need to check later errors.
+    if (changeAttrError && changeAttrError->error_code == XCB_WINDOW) {
+        return false;
+    }
+
+    return true;
 }
 
 bool FdoSelectionManager::nativeEventFilter(const QByteArray& eventType, void* message, long int* result)
@@ -130,6 +142,11 @@
         if (m_proxies[unmappedWId]) {
             undock(unmappedWId);
         }
+    } else if (responseType == XCB_DESTROY_NOTIFY) {
+        const auto destroyedWId = reinterpret_cast<xcb_destroy_notify_event_t *>(ev)->window;
+        if (m_proxies[destroyedWId]) {
+            undock(destroyedWId);
+        }
     } else if (responseType == m_damageEventBase + XCB_DAMAGE_NOTIFY) {
         const auto damagedWId = reinterpret_cast<xcb_damage_notify_event_t *>(ev)->drawable;
         const auto sniProx = m_proxies[damagedWId];
@@ -153,8 +170,9 @@
         return;
     }
 
-    addDamageWatch(winId);
-    m_proxies[winId] = new SNIProxy(winId, this);
+    if (addDamageWatch(winId)) {
+        m_proxies[winId] = new SNIProxy(winId, this);
+    }
 }
 
 void FdoSelectionManager::undock(xcb_window_t winId)

--- a/xembed-sni-proxy/fdoselectionmanager.h
+++ b/xembed-sni-proxy/fdoselectionmanager.h
@@ -48,7 +48,7 @@
 
 private:
     void init();
-    void addDamageWatch(xcb_window_t client);
+    bool addDamageWatch(xcb_window_t client);
     void dock(xcb_window_t embed_win);
     void undock(xcb_window_t client);