Projucer: Fixed a crash that could occur when saving a project multiple times

extras/Projucer/Source/Project/UI/jucer_ProjectContentComponent.cpp

@@ -810,7 +810,7 @@ void ProjectContentComponent::getCommandInfo (const CommandID commandID, Applica
         result.setInfo ("Save Project",
                         "Saves the current project",
                         CommandCategories::general, 0);
-        result.setActive (project != nullptr);
+        result.setActive (project != nullptr && ! project->isCurrentlySaving());
         break;
 
     case CommandIDs::closeProject:
@@ -824,7 +824,7 @@ void ProjectContentComponent::getCommandInfo (const CommandID commandID, Applica
         result.setInfo ("Save" + documentName,
                         "Saves the current document",
                         CommandCategories::general, 0);
-        result.setActive (currentDocument != nullptr || project != nullptr);
+        result.setActive (currentDocument != nullptr || (project != nullptr && ! project->isCurrentlySaving()));
         result.defaultKeypresses.add (KeyPress ('s', ModifierKeys::commandModifier, 0));
         break;
 
@@ -935,7 +935,7 @@ void ProjectContentComponent::getCommandInfo (const CommandID commandID, Applica
         result.setInfo ("Save Project and Open in IDE...",
                         "Saves the project and launches it in an external IDE",
                         CommandCategories::general, 0);
-        result.setActive (ProjectExporter::canProjectBeLaunched (project));
+        result.setActive (ProjectExporter::canProjectBeLaunched (project) && ! project->isCurrentlySaving());
         result.defaultKeypresses.add (KeyPress ('l', ModifierKeys::commandModifier | ModifierKeys::shiftModifier, 0));
         break;
 
@@ -1049,6 +1049,10 @@ void ProjectContentComponent::getCommandInfo (const CommandID commandID, Applica
 
 bool ProjectContentComponent::perform (const InvocationInfo& info)
 {
+    // don't allow the project to be saved again if it's currently saving
+    if (isSaveCommand (info.commandID) && (project != nullptr && project->isCurrentlySaving()))
+        return false;
+
     switch (info.commandID)
     {
         case CommandIDs::saveProject:
@@ -1121,6 +1125,11 @@ bool ProjectContentComponent::perform (const InvocationInfo& info)
     return true;
 }
 
+bool ProjectContentComponent::isSaveCommand (const CommandID id)
+{
+    return (id == CommandIDs::saveProject || id == CommandIDs::saveDocument || id == CommandIDs::saveAndOpenInIDE);
+}
+
 void ProjectContentComponent::getSelectedProjectItemsBeingDragged (const DragAndDropTarget::SourceDetails& dragSourceDetails,
                                                                    OwnedArray<Project::Item>& selectedNodes)
 {

extras/Projucer/Source/Project/UI/jucer_ProjectContentComponent.h

@@ -129,6 +129,8 @@ public:
     void getCommandInfo (CommandID, ApplicationCommandInfo&) override;
     bool perform (const InvocationInfo&) override;
 
+    bool isSaveCommand (const CommandID id);
+
     void paint (Graphics&) override;
     void resized() override;
     void childBoundsChanged (Component*) override;

extras/Projucer/Source/Project/jucer_Project.cpp

@@ -928,6 +928,10 @@ void Project::Item::setID (const String& newID)   { state.setProperty (Ids::ID,
 Drawable* Project::Item::loadAsImageFile() const
 {
     const MessageManagerLock mml (ThreadPoolJob::getCurrentThreadPoolJob());
+
+    if (! mml.lockWasGained())
+        return nullptr;
+
     return isValid() ? Drawable::createFromImageFile (getFile())
                      : nullptr;
 }

extras/Projucer/Source/Project/jucer_Project.h

@@ -358,6 +358,7 @@ public:
     String getUniqueTargetFolderSuffixForExporter (const String& exporterName, const String& baseTargetFolder);
 
     //==============================================================================
+    bool isCurrentlySaving() const noexcept     { return isSaving; }
     bool shouldWaitAfterSaving = false;
     String specifiedExporterToSave = {};