Merge pull request #99 from dalance/fix_panic_in_drop

Fix panic in drop

Author: 38

src/drawing/backend_impl/bitmap.rs

@@ -998,7 +998,8 @@ impl<'a, P: PixelFormat> DrawingBackend for BitMapBackend<'a, P> {
 impl<P: PixelFormat> Drop for BitMapBackend<'_, P> {
     fn drop(&mut self) {
         if !self.saved {
-            self.present().expect("Unable to save the bitmap");
+            // drop should not panic, so we ignore a failed present
+            let _ = self.present();
         }
     }
 }

src/drawing/backend_impl/svg.rs

@@ -565,7 +565,8 @@ impl<'a> DrawingBackend for SVGBackend<'a> {
 impl Drop for SVGBackend<'_> {
     fn drop(&mut self) {
         if !self.saved {
-            self.present().expect("Unable to save the SVG image");
+            // drop should not panic, so we ignore a failed present
+            let _ = self.present();
         }
     }
 }