layout: Drop trailing whitespace

Otherwise sane editor setup is basically impossible since
we want to trim that by default (and not manually like here)
in the future.

src/layout.rs

@@ -1,17 +1,17 @@
 /*!
  * Layout-related data.
- * 
+ *
  * The `View` contains `Row`s and each `Row` contains `Button`s.
  * They carry data relevant to their positioning only,
  * except the Button, which also carries some data
  * about its appearance and function.
- * 
+ *
  * The layout is determined bottom-up, by measuring `Button` sizes,
  * deriving `Row` sizes from them, and then centering them within the `View`.
- * 
+ *
  * That makes the `View` position immutable,
  * and therefore different than the other positions.
- * 
+ *
  * Note that it might be a better idea
  * to make `View` position depend on its contents,
  * and let the renderer scale and center it within the widget.
@@ -64,7 +64,7 @@ pub mod c {
         pub x: f64,
         pub y: f64,
     }
-    
+
     impl Add for Point {
         type Output = Self;
         fn add(self, other: Self) -> Self {
@@ -81,7 +81,7 @@ pub mod c {
             }
         }
     }
-    
+
     impl Sub<&Point> for Point {
         type Output = Point;
         fn sub(self, other: &Point) -> Point {
@@ -152,14 +152,14 @@ pub mod c {
             }
         }
     }
-    
+
     // This is constructed only in C, no need for warnings
     #[allow(dead_code)]
     #[repr(transparent)]
     pub struct LevelKeyboard(*const c_void);
 
     // The following defined in Rust. TODO: wrap naked pointers to Rust data inside RefCells to prevent multiple writers
-    
+
     /// Positions the layout contents within the available space.
     /// The origin of the transformation is the point inside the margins.
     #[no_mangle]
@@ -271,7 +271,7 @@ pub mod c {
 
             let state = layout.find_button_by_position(point)
                 .map(|place| place.button.state.clone());
-            
+
             if let Some(state) = state {
                 seat::handle_press_key(
                     layout,
@@ -311,7 +311,7 @@ pub mod c {
             let point = ui_backend.widget_to_layout.forward(
                 Point { x: x_widget, y: y_widget }
             );
-            
+
             let pressed = layout.pressed_keys.clone();
             let button_info = {
                 let place = layout.find_button_by_position(point);
@@ -370,11 +370,11 @@ pub mod c {
         #[cfg(test)]
         mod test {
             use super::*;
-            
+
             fn near(a: f64, b: f64) -> bool {
                 (a - b).abs() < ((a + b) * 0.001f64).abs()
             }
-            
+
             #[test]
             fn transform_back() {
                 let transform = Transformation {
@@ -413,7 +413,7 @@ pub enum Label {
 /// The graphical representation of a button
 #[derive(Clone, Debug)]
 pub struct Button {
-    /// ID string, e.g. for CSS 
+    /// ID string, e.g. for CSS
     pub name: CString,
     /// Label to display to the user
     pub label: Label,
@@ -573,11 +573,11 @@ impl View {
             offset: &row.0 + c::Point { x: button.0, y: 0.0 },
         })
     }
-    
+
     pub fn get_size(&self) -> Size {
         self.size.clone()
     }
-    
+
     /// Returns positioned rows, with appropriate x offsets (centered)
     pub fn get_rows(&self) -> &Vec<(c::Point, Row)> {
         &self.rows
@@ -731,7 +731,7 @@ impl Layout {
             ),
         }
     }
-    
+
     pub fn calculate_transformation(
         &self,
         available: Size,
@@ -770,7 +770,7 @@ impl Layout {
             }
         }
     }
-    
+
     fn apply_view_transition(
         &mut self,
         action: &Action,
@@ -812,7 +812,7 @@ impl Layout {
     ///
     /// Although the state is not defined at the keys
     /// (it's in the relationship between view and action),
-    /// keys go through the following stages when clicked repeatedly: 
+    /// keys go through the following stages when clicked repeatedly:
     /// unlocked+unlatched -> locked+latched -> locked+unlatched
     /// -> unlocked+unlatched
     fn process_action_for_view<'a>(
@@ -906,7 +906,7 @@ mod procedures {
                 })
         }).collect()
     }
-    
+
     #[cfg(test)]
     mod test {
         use super::*;
@@ -1113,7 +1113,7 @@ mod test {
             state: state,
         })
     }
-    
+
     #[test]
     fn latch_lock_unlock() {
         let action = Action::LockView {
@@ -1152,7 +1152,7 @@ mod test {
             latches: true,
             looks_locked_from: vec![],
         };
-        
+
         let submit = Action::Erase;
 
         let view = View::new(vec![(
@@ -1194,7 +1194,7 @@ mod test {
                 "base".into() => (c::Point { x: 0.0, y: 0.0 }, view.clone()),
                 "locked".into() => (c::Point { x: 0.0, y: 0.0 }, view),
             },
-        };        
+        };
 
         // Basic cycle
         layout.apply_view_transition(&switch);
@@ -1220,14 +1220,14 @@ mod test {
             latches: true,
             looks_locked_from: vec![],
         };
-        
+
         let unswitch = Action::LockView {
             lock: "locked".into(),
             unlock: "unlocked".into(),
             latches: false,
             looks_locked_from: vec![],
         };
-        
+
         let submit = Action::Erase;
 
         let view = View::new(vec![(
@@ -1286,14 +1286,14 @@ mod test {
             latches: true,
             looks_locked_from: vec![],
         };
-        
+
         let switch_again = Action::LockView {
             lock: "ĄĘ".into(),
             unlock: "locked".into(),
             latches: true,
             looks_locked_from: vec![],
         };
-        
+
         let submit = Action::Erase;
 
         let view = View::new(vec![(