fixed an issue where reloadThumbnails & treeviewSelectionChanged would be called every time a page is deleted ! Resulting on really poor performances for the deletion operation, even in a crash, if trying with a lot of pages.

.qmake.stash

@@ -0,0 +1,23 @@
+QMAKE_CXX.QT_COMPILER_STDCXX = 201402L
+QMAKE_CXX.QMAKE_GCC_MAJOR_VERSION = 9
+QMAKE_CXX.QMAKE_GCC_MINOR_VERSION = 3
+QMAKE_CXX.QMAKE_GCC_PATCH_VERSION = 0
+QMAKE_CXX.COMPILER_MACROS = \
+    QT_COMPILER_STDCXX \
+    QMAKE_GCC_MAJOR_VERSION \
+    QMAKE_GCC_MINOR_VERSION \
+    QMAKE_GCC_PATCH_VERSION
+QMAKE_CXX.INCDIRS = \
+    /usr/include/c++/9 \
+    /usr/include/x86_64-linux-gnu/c++/9 \
+    /usr/include/c++/9/backward \
+    /usr/lib/gcc/x86_64-linux-gnu/9/include \
+    /usr/local/include \
+    /usr/include/x86_64-linux-gnu \
+    /usr/include
+QMAKE_CXX.LIBDIRS = \
+    /usr/lib/gcc/x86_64-linux-gnu/9 \
+    /usr/lib/x86_64-linux-gnu \
+    /usr/lib \
+    /lib/x86_64-linux-gnu \
+    /lib

src/core/UBPersistenceManager.cpp

@@ -622,11 +622,6 @@ void UBPersistenceManager::deleteDocumentScenes(UBDocumentProxy* proxy, const QL
     if (compactedIndexes.size() == 0)
         return;
 
-    foreach(int index, compactedIndexes)
-    {
-        emit documentSceneWillBeDeleted(proxy, index);
-    }
-
     QString sourceName = proxy->metaData(UBSettings::documentName).toString();
     UBDocumentProxy *trashDocProxy = createDocument(UBSettings::trashedDocumentGroupNamePrefix/* + sourceGroupName*/, sourceName, false);
 

src/core/UBPersistenceManager.h

@@ -166,7 +166,6 @@ class UBPersistenceManager : public QObject
         void documentWillBeDeleted(UBDocumentProxy* pDocumentProxy);
 
         void documentSceneCreated(UBDocumentProxy* pDocumentProxy, int pIndex);
-        void documentSceneWillBeDeleted(UBDocumentProxy* pDocumentProxy, int pIndex);
 
 private:
         int sceneCount(const UBDocumentProxy* pDocumentProxy);

src/document/UBDocumentController.cpp

@@ -2128,7 +2128,6 @@ void UBDocumentController::setupViews()
         connect(mDocumentUI->thumbnailWidget->scene(), SIGNAL(selectionChanged()), this, SLOT(pageSelectionChanged()));
 
         connect(UBPersistenceManager::persistenceManager(), SIGNAL(documentSceneCreated(UBDocumentProxy*, int)), this, SLOT(documentSceneChanged(UBDocumentProxy*, int)));
-        connect(UBPersistenceManager::persistenceManager(), SIGNAL(documentSceneWillBeDeleted(UBDocumentProxy*, int)), this, SLOT(documentSceneChanged(UBDocumentProxy*, int)));
 
         mDocumentUI->thumbnailWidget->setBackgroundBrush(UBSettings::documentViewLightColor);