Backport of upstream commit [1] to fix build with Qt 6.10.

[1] https://github.com/zealdocs/zeal/commit/11f6a85bb5f314ba8e1dbdc7654ef2647b75161e

--- src/libs/ui/docsetsdialog.cpp.orig	2024-09-08 15:33:39 UTC
+++ src/libs/ui/docsetsdialog.cpp
@@ -360,7 +360,8 @@ void DocsetsDialog::downloadCompleted()
         QTemporaryFile *tmpFile = m_tmpFiles[docsetName];
         if (!tmpFile) {
             tmpFile = new QTemporaryFile(QStringLiteral("%1/%2.XXXXXX.tmp").arg(Core::Application::cacheLocation(), docsetName), this);
-            tmpFile->open();
+            if (!tmpFile->open())
+                return;
             m_tmpFiles.insert(docsetName, tmpFile);
         }
 
@@ -403,7 +404,8 @@ void DocsetsDialog::downloadProgress(qint64 received, 
         QTemporaryFile *tmpFile = m_tmpFiles[docsetName];
         if (!tmpFile) {
             tmpFile = new QTemporaryFile(QStringLiteral("%1/%2.XXXXXX.tmp").arg(Core::Application::cacheLocation(), docsetName), this);
-            tmpFile->open();
+            if (!tmpFile->open())
+                return;
             m_tmpFiles.insert(docsetName, tmpFile);
         }
 
--- src/libs/ui/qxtglobalshortcut/CMakeLists.txt.orig	2024-09-08 15:33:39 UTC
+++ src/libs/ui/qxtglobalshortcut/CMakeLists.txt
@@ -42,6 +42,9 @@ elseif(UNIX AND X11_FOUND)
         find_package(Qt5 COMPONENTS X11Extras REQUIRED)
         target_link_libraries(QxtGlobalShortcut Qt5::X11Extras)
     else()
+        if(Qt6Core_VERSION VERSION_GREATER_EQUAL 6.10)
+            find_package(Qt6 COMPONENTS GuiPrivate REQUIRED)
+        endif()
         target_link_libraries(QxtGlobalShortcut Qt${QT_VERSION_MAJOR}::GuiPrivate)
     endif()