fix: replace println! with eprintln!

src/femtovg_area/imp.rs

@@ -128,7 +128,7 @@ impl GLAreaImpl for FemtoVGArea {
             {
                 Ok(t) => t,
                 Err(e) => {
-                    println!("Error while rendering image: {e}");
+                    eprintln!("Error while rendering image: {e}");
                     return glib::Propagation::Stop;
                 }
             };
@@ -149,7 +149,7 @@ impl GLAreaImpl for FemtoVGArea {
             .expect("Did you call init before using FemtoVgArea?")
             .render_framebuffer(canvas, font)
         {
-            println!("Error rendering to framebuffer: {e}");
+            eprintln!("Error rendering to framebuffer: {e}");
         }
         glib::Propagation::Stop
     }
@@ -217,7 +217,7 @@ impl FemtoVGArea {
                     loaded_fonts.push(id);
                 }
                 Err(e) => {
-                    println!("Error while loading font. Using default font: {e}");
+                    eprintln!("Error while loading font. Using default font: {e}");
                 }
             }
         }

src/main.rs

@@ -191,7 +191,7 @@ impl App {
                     gtk::style_context_add_provider_for_display(&display, &css_provider2, 1)
                 }
             }
-            None => println!("Cannot apply style"),
+            None => eprintln!("Cannot apply style"),
         }
     }
 }

src/notification.rs

@@ -4,7 +4,7 @@ use relm4::gtk::gio::{Notification, prelude::ApplicationExt};
 use relm4::gtk::{IconLookupFlags, IconTheme, TextDirection};
 
 pub fn log_result(msg: &str, notify: bool) {
-    println!("{msg}");
+    eprintln!("{msg}");
     if notify {
         show_notification(msg);
     }

src/sketch_board.rs

@@ -368,7 +368,7 @@ impl SketchBoard {
     fn handle_save(&self, image: &Pixbuf) {
         let mut output_filename = match APP_CONFIG.read().output_filename() {
             None => {
-                println!("No Output filename specified!");
+                eprintln!("No Output filename specified!");
                 return;
             }
             Some(o) => o.clone(),
@@ -381,7 +381,7 @@ impl SketchBoard {
         });
 
         if result.is_err() {
-            println!(
+            eprintln!(
                 "Warning: Could not format filename {output_filename} due to chrono format error, falling back to literal filename."
             );
         } else {
@@ -416,7 +416,7 @@ impl SketchBoard {
         let data = match image.save_to_bufferv("png", &Vec::new()) {
             Ok(d) => d,
             Err(e) => {
-                println!("Error serializing image: {e}");
+                eprintln!("Error serializing image: {e}");
                 return;
             }
         };
@@ -456,7 +456,7 @@ impl SketchBoard {
         let data = match pixbuf.save_to_bufferv("png", &Vec::new()) {
             Ok(d) => d,
             Err(e) => {
-                println!("Error serializing image: {e}");
+                eprintln!("Error serializing image: {e}");
                 return;
             }
         };
@@ -566,7 +566,7 @@ impl SketchBoard {
         };
 
         match result {
-            Err(e) => println!("Error saving {e}"),
+            Err(e) => eprintln!("Error saving {e}"),
             Ok(()) => {
                 log_result(
                     "Copied to clipboard.",
@@ -1142,7 +1142,6 @@ impl Component for SketchBoard {
             }
         };
 
-        // println!(" Result={:?}", result);
         match result {
             ToolUpdateResult::Commit(drawable) => {
                 self.renderer.commit(drawable);