Fix bug where the palette weren't updated on the screen after converting the sprite color space

src/app/app.cpp

@@ -578,8 +578,7 @@ InputChain& App::inputChain()
 }
 #endif
 
-// Updates palette and redraw the screen.
+void app_update_current_palette()
-void app_refresh_screen()
 {
 #ifdef ENABLE_UI
   Context* context = UIContext::instance();
@@ -590,7 +589,15 @@ void app_refresh_screen()
   if (Palette* pal = site.palette())
     set_current_palette(pal, false);
   else
-    set_current_palette(NULL, false);
+    set_current_palette(nullptr, false);
+#endif // ENABLE_UI
+}
+
+// Updates palette and redraw the screen.
+void app_refresh_screen()
+{
+#ifdef ENABLE_UI
+  app_update_current_palette();
 
   // Invalidate the whole screen.
   ui::Manager::getDefault()->invalidate();

src/app/app.h

@@ -147,6 +147,7 @@ namespace app {
 #endif
   };
 
+  void app_update_current_palette();
   void app_refresh_screen();
   void app_rebuild_documents_tabs();
   PixelFormat app_get_current_pixel_format();

src/app/doc.cpp

@@ -34,6 +34,7 @@
 #include "doc/sprite.h"
 #include "os/display.h"
 #include "os/system.h"
+#include "ui/system.h"
 
 #include <limits>
 #include <map>
@@ -508,6 +509,14 @@ void Doc::updateOSColorSpace(bool appWideSignal)
       context()->activeDocument() == this) {
     App::instance()->ColorSpaceChange();
   }
+
+  if (ui::is_ui_thread()) {
+    // As the color space has changed, we might need to upate the
+    // current palette (because the color space conversion might be
+    // came from a cmd::ConvertColorProfile, so the palette might be
+    // changed). This might generate a PaletteChange() signal.
+    app_update_current_palette();
+  }
 }
 
 // static