cropping ui partly done (upper left cropper works)

src/send_image_popup.hpp

@@ -22,14 +22,16 @@ struct SendImagePopup {
 	ImageLoaderI::ImageResult original_image;
 
 	struct Rect {
-		uint32_t x {0};
-		uint32_t y {0};
+		int32_t x {0};
+		int32_t y {0};
 
-		uint32_t w {0};
-		uint32_t h {0};
+		int32_t w {0};
+		int32_t h {0};
 	};
 	Rect crop_rect;
 
+	bool cropping {false};
+
 	// texture to render (orig img)
 	TextureEntry preview_image;