Fixed use after free for several scenarios when destroying the display

Author: sadko4u

CHANGELOG

@@ -3,7 +3,7 @@
 *******************************************************************************
 
 === 1.0.30 ===
-
+* Fixed use after free for several scenarios when destroying the display.
 
 === 1.0.29 ===
 * Added text clipping function for tk::Label.

include/lsp-plug.in/tk/style/Schema.h

@@ -136,6 +136,8 @@ namespace lsp
                 Schema(Schema &&) = delete;
                 virtual ~Schema();
 
+                void                destroy();
+
                 Schema & operator = (const Schema &) = delete;
                 Schema & operator = (Schema &&) = delete;
 

src/main/style/Schema.cpp

@@ -60,6 +60,11 @@ namespace lsp
         }
 
         Schema::~Schema()
+        {
+            destroy();
+        }
+
+        void Schema::destroy()
         {
             // Manually unbind all properties before destroying context
             sScaling.unbind();

src/main/sys/Display.cpp

@@ -81,6 +81,9 @@ namespace lsp
             sSlots.execute(SLOT_DESTROY, NULL);
             sSlots.destroy();
 
+            // Destroy schema
+            sSchema.destroy();
+
             // Destroy display
             if (pDisplay != NULL)
             {