Wayland: double click (#9608)

This PR builds off of an earlier version of
https://github.com/zed-industries/zed/pull/9595, rearranges some of the
logic, and removes an unused platform API.

Release Notes:

- N/A

---------

Co-authored-by: apricotbucket28 <agustin.nicolas.marcos@outlook.com>

crates/gpui/src/platform/linux/platform.rs

@@ -22,8 +22,8 @@ use wayland_client::Connection;
 use crate::platform::linux::client::Client;
 use crate::platform::linux::wayland::WaylandClient;
 use crate::{
-    Action, AnyWindowHandle, BackgroundExecutor, ClipboardItem, CursorStyle, DisplayId,
-    ForegroundExecutor, Keymap, LinuxDispatcher, LinuxTextSystem, Menu, PathPromptOptions,
+    px, Action, AnyWindowHandle, BackgroundExecutor, ClipboardItem, CursorStyle, DisplayId,
+    ForegroundExecutor, Keymap, LinuxDispatcher, LinuxTextSystem, Menu, PathPromptOptions, Pixels,
     Platform, PlatformDisplay, PlatformInput, PlatformTextSystem, PlatformWindow, Result,
     SemanticVersion, Task, WindowOptions, WindowParams,
 };
@@ -32,6 +32,11 @@ use super::x11::X11Client;
 
 pub(super) const SCROLL_LINES: f64 = 3.0;
 
+// Values match the defaults on GTK.
+// Taken from https://github.com/GNOME/gtk/blob/main/gtk/gtksettings.c#L320
+pub(super) const DOUBLE_CLICK_INTERVAL: Duration = Duration::from_millis(400);
+pub(super) const DOUBLE_CLICK_DISTANCE: Pixels = px(5.0);
+
 #[derive(Default)]
 pub(crate) struct Callbacks {
     open_urls: Option<Box<dyn FnMut(Vec<String>)>>,
@@ -310,10 +315,6 @@ impl Platform for LinuxPlatform {
         "Linux"
     }
 
-    fn double_click_interval(&self) -> Duration {
-        Duration::default()
-    }
-
     fn os_version(&self) -> Result<SemanticVersion> {
         Ok(SemanticVersion {
             major: 1,