diff --git a/examples/demo/app.rs b/examples/demo/app.rs
index 4ee6fd88..84a80c4b 100644
--- a/examples/demo/app.rs
+++ b/examples/demo/app.rs
@@ -122,7 +122,7 @@ pub struct TabsState<'a> {
 }
 
 impl<'a> TabsState<'a> {
-    pub fn new(titles: Vec<&'a str>) -> Self {
+    pub const fn new(titles: Vec<&'a str>) -> Self {
         Self { titles, index: 0 }
     }
     pub fn next(&mut self) {
diff --git a/src/terminal/terminal.rs b/src/terminal/terminal.rs
index 5bc12566..13c8212a 100644
--- a/src/terminal/terminal.rs
+++ b/src/terminal/terminal.rs
@@ -205,7 +205,6 @@ where
     /// of the screen.
     pub fn resize(&mut self, area: Rect) -> io::Result<()> {
         let next_area = match self.viewport {
-            Viewport::Fullscreen => area,
             Viewport::Inline(height) => {
                 let offset_in_previous_viewport = self
                     .last_known_cursor_pos
@@ -219,7 +218,7 @@ where
                 )?
                 .0
             }
-            Viewport::Fixed(_) => area,
+            Viewport::Fixed(_) | Viewport::Fullscreen => area,
         };
         self.set_viewport_area(next_area);
         self.clear()?;
diff --git a/src/widgets/reflow.rs b/src/widgets/reflow.rs
index 0e7224eb..856e239f 100644
--- a/src/widgets/reflow.rs
+++ b/src/widgets/reflow.rs
@@ -51,7 +51,7 @@ where
     O: Iterator<Item = (I, Alignment)>,
     I: Iterator<Item = StyledGrapheme<'a>>,
 {
-    pub fn new(lines: O, max_line_width: u16, trim: bool) -> Self {
+    pub const fn new(lines: O, max_line_width: u16, trim: bool) -> Self {
         Self {
             input_lines: lines,
             max_line_width,
@@ -250,7 +250,7 @@ where
     O: Iterator<Item = (I, Alignment)>,
     I: Iterator<Item = StyledGrapheme<'a>>,
 {
-    pub fn new(lines: O, max_line_width: u16) -> Self {
+    pub const fn new(lines: O, max_line_width: u16) -> Self {
         Self {
             input_lines: lines,
             max_line_width,
diff --git a/src/widgets/sparkline.rs b/src/widgets/sparkline.rs
index 670ca110..760c6357 100644
--- a/src/widgets/sparkline.rs
+++ b/src/widgets/sparkline.rs
@@ -237,7 +237,7 @@ mod tests {
 
     // Helper function to render a sparkline to a buffer with a given width
     // filled with x symbols to make it easier to assert on the result
-    fn render(widget: Sparkline, width: u16) -> Buffer {
+    fn render(widget: Sparkline<'_>, width: u16) -> Buffer {
         let area = Rect::new(0, 0, width, 1);
         let mut buffer = Buffer::filled(area, Cell::new("x"));
         widget.render(area, &mut buffer);
@@ -253,6 +253,8 @@ mod tests {
 
     #[test]
     fn it_does_not_panic_if_max_is_set_to_zero() {
+        // see https://github.com/rust-lang/rust-clippy/issues/13191
+        #[allow(clippy::unnecessary_min_or_max)]
         let widget = Sparkline::default().data(&[0, 1, 2]).max(0);
         let buffer = render(widget, 6);
         assert_eq!(buffer, Buffer::with_lines(["   xxx"]));