Desktop: Support receiving double click inputs (#3168)

* input support double clicks and clean up

* Review improvements

Author: timon-schelling

desktop/src/cef/consts.rs

@@ -1,2 +1,12 @@
+use std::time::Duration;
+
 pub(crate) const RESOURCE_SCHEME: &str = "resources";
 pub(crate) const RESOURCE_DOMAIN: &str = "resources";
+
+pub(crate) const SCROLL_LINE_HEIGHT: usize = 40;
+pub(crate) const SCROLL_LINE_WIDTH: usize = 40;
+pub(crate) const SCROLL_SPEED_X: f32 = 3.0;
+pub(crate) const SCROLL_SPEED_Y: f32 = 3.0;
+
+pub(crate) const MULTICLICK_TIMEOUT: Duration = Duration::from_millis(500);
+pub(crate) const MULTICLICK_ALLOWED_TRAVEL: usize = 4;