Close dialog on esc if text input is focused

Closes: pop-os/cosmic-edit#350

Escape unfocusses the main text input widget instead of closing the
dialog. The user has to hit escape twice to close the window. It's not a
big deal, but it's also unexpected and unergonomic.

Author: joshuamegnauth54

src/dialog.rs

@@ -10,11 +10,12 @@ use cosmic::{
         keyboard::{Event as KeyEvent, Key, Modifiers},
         mouse, stream, window, Alignment, Event, Length, Point, Size, Subscription,
     },
+    iced_core::widget::operation,
     theme,
     widget::{
         self,
         menu::{key_bind::Modifier, Action as MenuAction, KeyBind},
-        segmented_button,
+        segmented_button, Operation,
     },
     Application, ApplicationExt, Element,
 };
@@ -1177,6 +1178,13 @@ impl Application for App {
             return Task::none();
         }
 
+        // Close the dialog if the focused widget is the dialog's main text input instead of
+        // unfocussing the widget.
+        let focused = operation::focusable::find_focused().finish();
+        if (self.dialog_text_input == focused) {
+            return self.update(Message::Cancel);
+        }
+
         self.update(Message::Cancel)
     }