Don't use 'width' for Shape args

It's easy to get confused with the width field.

Author: camsteffen

src/shape.rs

@@ -213,8 +213,8 @@ impl Shape {
         }
     }
 
-    pub(crate) fn block_left(&self, width: usize) -> Option<Shape> {
-        self.block_indent(width).sub_width(width)
+    pub(crate) fn block_left(&self, n: usize) -> Option<Shape> {
+        self.block_indent(n).sub_width(n)
     }
 
     pub(crate) fn add_offset(&self, extra_width: usize) -> Shape {
@@ -231,27 +231,27 @@ impl Shape {
         }
     }
 
-    pub(crate) fn saturating_sub_width(&self, width: usize) -> Shape {
-        self.sub_width(width).unwrap_or(Shape { width: 0, ..*self })
+    pub(crate) fn saturating_sub_width(&self, n: usize) -> Shape {
+        self.sub_width(n).unwrap_or(Shape { width: 0, ..*self })
     }
 
-    pub(crate) fn sub_width(&self, width: usize) -> Option<Shape> {
+    pub(crate) fn sub_width(&self, n: usize) -> Option<Shape> {
         Some(Shape {
-            width: self.width.checked_sub(width)?,
+            width: self.width.checked_sub(n)?,
             ..*self
         })
     }
 
-    pub(crate) fn shrink_left(&self, width: usize) -> Option<Shape> {
+    pub(crate) fn shrink_left(&self, n: usize) -> Option<Shape> {
         Some(Shape {
-            width: self.width.checked_sub(width)?,
-            indent: self.indent + width,
-            offset: self.offset + width,
+            width: self.width.checked_sub(n)?,
+            indent: self.indent + n,
+            offset: self.offset + n,
         })
     }
 
-    pub(crate) fn offset_left(&self, width: usize) -> Option<Shape> {
-        self.add_offset(width).sub_width(width)
+    pub(crate) fn offset_left(&self, n: usize) -> Option<Shape> {
+        self.add_offset(n).sub_width(n)
     }
 
     pub(crate) fn used_width(&self) -> usize {