Fix selection copying with mouse outside of window

There was an issue caused by 35efb4619c4b7a77b3c30de763856bc4441e236e
which would lead to the current selection not getting copied to the
clipboard if the mouse was released outside of the window.

Instead of aborting any press/release actions when the cursor is not
inside of Alacritty, the handling is now delayed until actual usage.

2 files changed, 34 insertions, 29 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd3b0e28..49181cc1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Fix panic which could occur when quitting Alacritty on Windows if using the Conpty backend
+- Automatic copying of selection to clipboard when mouse is released outside of Alacritty
 
 ## Version 0.2.9
 
diff --git a/src/input.rs b/src/input.rs
index 11091575..7779dca9 100644
--- a/src/input.rs
+++ b/src/input.rs
@@ -33,7 +33,7 @@ use crate::term::{Term, SizeInfo, Search};
 use crate::term::mode::TermMode;
 use crate::util::fmt::Red;
 use crate::util::start_daemon;
-use crate::message_bar;
+use crate::message_bar::{self, Message};
 use crate::ansi::{Handler, ClearMode};
 
 pub const FONT_SIZE_STEP: f32 = 0.5;
@@ -394,7 +394,7 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
         }
 
         // Ignore motions over the message bar
-        if self.mouse_over_message_bar(point) {
+        if self.message_at_point(Some(point)).is_some() {
             return;
         }
 
@@ -497,14 +497,14 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
         }
     }
 
-    pub fn on_mouse_double_click(&mut self, button: MouseButton, point: Point) {
-        if button == MouseButton::Left {
+    pub fn on_mouse_double_click(&mut self, button: MouseButton, point: Option<Point>) {
+        if let (Some(point), true) = (point, button == MouseButton::Left) {
             self.ctx.semantic_selection(point);
         }
     }
 
-    pub fn on_mouse_triple_click(&mut self, button: MouseButton, point: Point) {
-        if button == MouseButton::Left {
+    pub fn on_mouse_triple_click(&mut self, button: MouseButton, point: Option<Point>) {
+        if let (Some(point), true) = (point, button == MouseButton::Left) {
             self.ctx.line_selection(point);
         }
     }
@@ -513,7 +513,7 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
         &mut self,
         button: MouseButton,
         modifiers: ModifiersState,
-        point: Point,
+        point: Option<Point>,
     ) {
         let now = Instant::now();
         let elapsed = self.ctx.mouse().last_click_timestamp.elapsed();
@@ -544,7 +544,9 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
 
                 // Start new empty selection
                 let side = self.ctx.mouse().cell_side;
-                self.ctx.simple_selection(point, side);
+                if let Some(point) = point {
+                    self.ctx.simple_selection(point, side);
+                }
 
                 let report_modes =
                     TermMode::MOUSE_REPORT_CLICK | TermMode::MOUSE_DRAG | TermMode::MOUSE_MOTION;
@@ -569,7 +571,7 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
         &mut self,
         button: MouseButton,
         modifiers: ModifiersState,
-        point: Point,
+        point: Option<Point>,
     ) {
         let report_modes =
             TermMode::MOUSE_REPORT_CLICK | TermMode::MOUSE_DRAG | TermMode::MOUSE_MOTION;
@@ -583,7 +585,7 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
             };
             self.mouse_report(code, ElementState::Released, modifiers);
             return;
-        } else if button == MouseButton::Left {
+        } else if let (Some(point), true) = (point, button == MouseButton::Left) {
             self.launch_url(modifiers, point);
         }
 
@@ -712,14 +714,13 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
             _ => (),
         }
 
-        let point = match self.ctx.mouse_coords() {
-            Some(point) => point,
-            None => return,
-        };
+        let point = self.ctx.mouse_coords();
 
         // Skip normal mouse events if the message bar has been clicked
-        if self.mouse_over_message_bar(point) {
-            self.on_message_bar_click(state, point);
+        if let Some(message) = self.message_at_point(point) {
+            // Message should never be `Some` if point is `None`
+            debug_assert!(point.is_some());
+            self.on_message_bar_click(state, point.unwrap(), message);
         } else {
             match state {
                 ElementState::Pressed => {
@@ -841,28 +842,31 @@ impl<'a, A: ActionContext + 'a> Processor<'a, A> {
         has_binding
     }
 
-    /// Check if a point is within the message bar
-    fn mouse_over_message_bar(&mut self, point: Point) -> bool {
-        if let Some(message) = self.ctx.terminal_mut().message_buffer_mut().message() {
+    /// Return the message bar's message if there is some at the specified point
+    fn message_at_point(&mut self, point: Option<Point>) -> Option<Message> {
+        if let (Some(point), Some(message)) = (
+            point,
+            self.ctx.terminal_mut().message_buffer_mut().message(),
+        ) {
             let size = self.ctx.size_info();
-            point.line.0 >= size.lines().saturating_sub(message.text(&size).len())
-        } else {
-            false
+            if point.line.0 >= size.lines().saturating_sub(message.text(&size).len()) {
+                return Some(message);
+            }
         }
+
+        None
     }
 
     /// Handle clicks on the message bar.
-    fn on_message_bar_click(&mut self, button_state: ElementState, point: Point) {
+    fn on_message_bar_click(&mut self, button_state: ElementState, point: Point, message: Message) {
         match button_state {
             ElementState::Released => self.copy_selection(),
             ElementState::Pressed => {
                 let size = self.ctx.size_info();
-                if let Some(message) = self.ctx.terminal_mut().message_buffer_mut().message() {
-                    if point.col + message_bar::CLOSE_BUTTON_TEXT.len() >= size.cols()
-                        && point.line == size.lines() - message.text(&size).len()
-                    {
-                        self.ctx.terminal_mut().message_buffer_mut().pop();
-                    }
+                if point.col + message_bar::CLOSE_BUTTON_TEXT.len() >= size.cols()
+                    && point.line == size.lines() - message.text(&size).len()
+                {
+                    self.ctx.terminal_mut().message_buffer_mut().pop();
                 }
 
                 self.ctx.clear_selection();