The thread safety stuff is only needed for GTK

src/gfx/generated_image.hpp

@@ -65,7 +65,7 @@ class LinearBlendImage : public GeneratedImage {
 	virtual ImageCombine combine() const;
 	virtual bool operator == (const GeneratedImage& that) const;
 	
-	virtual bool threadSafe() const {return true;}
+	virtual bool threadSafe() const { return true; }
   private:
 	GeneratedImageP image1, image2;
 	double x1, y1, x2, y2;
@@ -83,7 +83,7 @@ class MaskedBlendImage : public GeneratedImage {
 	virtual ImageCombine combine() const;
 	virtual bool operator == (const GeneratedImage& that) const;
 	
-	virtual bool threadSafe() const {return true;}
+	virtual bool threadSafe() const { return true; }
   private:
 	GeneratedImageP light, dark, mask;
 };
@@ -100,7 +100,7 @@ class CombineBlendImage : public GeneratedImage {
 	virtual ImageCombine combine() const;
 	virtual bool operator == (const GeneratedImage& that) const;
 	
-	virtual bool threadSafe() const {return true;}
+	virtual bool threadSafe() const { return true; }
   private:
 	GeneratedImageP image1, image2;
 	ImageCombine image_combine;
@@ -118,7 +118,7 @@ class SetMaskImage : public GeneratedImage {
 	virtual ImageCombine combine() const;
 	virtual bool operator == (const GeneratedImage& that) const;
 	
-	virtual bool threadSafe() const {return true;}
+	virtual bool threadSafe() const { return true; }
   private:
 	GeneratedImageP image, mask;
 };
@@ -152,7 +152,7 @@ class PackagedImage : public GeneratedImage {
 	virtual Image generate(const Options& opt) const;
 	virtual bool operator == (const GeneratedImage& that) const;
 	
-	virtual bool threadSafe() const {return true;}
+	virtual bool threadSafe() const { return true; }
   private:
 	String filename;
 };
@@ -168,7 +168,7 @@ class BuiltInImage : public GeneratedImage {
 	virtual Image generate(const Options& opt) const;
 	virtual bool operator == (const GeneratedImage& that) const;
 	
-	virtual bool threadSafe() const {return true;}
+	virtual bool threadSafe() const { return true; }
   private:
 	String name;
 };
@@ -183,7 +183,11 @@ class SymbolToImage : public GeneratedImage {
 	virtual Image generate(const Options& opt) const;
 	virtual bool operator == (const GeneratedImage& that) const;
 	
-	virtual bool threadSafe() const {return false;}
+	#ifdef __WXGTK__
+		virtual bool threadSafe() const { return false; }
+	#else
+		virtual bool threadSafe() const { return true; }
+	#endif
   private:
 	SymbolToImage(const SymbolToImage&); // copy ctor
 	String           filename;

src/gui/new_window.cpp

@@ -96,9 +96,9 @@ void NewSetWindow::done() {
 		set = new_intrusive1<Set>(stylesheet);
 		set->validate();
 		EndModal(wxID_OK);
-	} catch (Error& e) {
+	} catch (const Error& e) {
 		handle_error(e);
-	throw; // We want to crash.
+		EndModal(wxID_CANCEL);
 	}
 }
 

src/gui/set/window.cpp

@@ -173,8 +173,6 @@ SetWindow::~SetWindow() {
 	delete find_dialog;
 	// remove from list of set windows
 	set_windows.erase(remove(set_windows.begin(), set_windows.end(), this));
-	// stop updating
-	onBeforeChangeSet();
 }
 
 // ----------------------------------------------------------------------------- : Panel managment

src/script/image.hpp

@@ -47,7 +47,7 @@ class ScriptableImage {
 	}
 
 	/// Can this be safely generated from another thread?
-	bool threadSafe() const {return value != nullptr ? value->threadSafe() : false; }
+	inline bool threadSafe() const { return !value || value->threadSafe(); }
 	
   private:
 	OptionalScript  script;		///< The script, not really optional