fixes iced-rs#2359

The current implementation strictly scrolls vertically without the shift
modifier and horizontally with the shift modifier. This patch checks the
modifier only when the direction is Both.

widget/src/scrollable.rs

@@ -564,12 +564,18 @@ where
  let delta = match delta {
  mouse::ScrollDelta::Lines { x, y } => {
  // TODO: Configurable speed/friction (?)
- let movement = if !cfg!(target_os = "macos") // macOS automatically inverts the axes when Shift is pressed
- && state.keyboard_modifiers.shift()
- {
- Vector::new(y, x)
- } else {
- Vector::new(x, y)
+ let movement = match self.direction {
+ Direction::Vertical(_) => Vector::new(x, y),
+ Direction::Horizontal(_) => Vector::new(y, x),
+ Direction::Both { vertical: _, horizontal: _ } => {
+ if !cfg!(target_os = "macos") // macOS automatically inverts the axes when Shift is pressed
+ && state.keyboard_modifiers.shift()
+ {
+ Vector::new(y, x)
+ } else {
+ Vector::new(x, y)
+ }
+ }
  };
 
  movement * 60.0