Add DeleteToStartOfLine text shortcut for Cmd + Backspace key on macOS

Introduced a new text shortcut, `DeleteToStartOfLine`, to allow users to delete text from the cursor position to the start of the line when the Cmd + Backspace key is pressed on macOS.

Author: arkus7

internal/core/input.rs

@@ -415,6 +415,9 @@ impl KeyEvent {
                 key_codes::DownArrow => {
                     return Some(TextShortcut::Move(TextCursorDirection::EndOfText))
                 }
+                key_codes::Backspace => {
+                    return Some(TextShortcut::DeleteToStartOfLine);
+                }
                 _ => (),
             };
         }
@@ -467,6 +470,8 @@ pub enum TextShortcut {
     DeleteWordForward,
     /// Delete the word to the left of the cursor (aka Ctrl + Backspace).
     DeleteWordBackward,
+    /// Delete to the left of the cursor until the start of the line
+    DeleteToStartOfLine,
 }
 
 /// Represents how an item's key_event handler dealt with a key event.

internal/core/items/text.rs

@@ -776,6 +776,15 @@ impl Item for TextInput {
                             );
                             return KeyEventResult::EventAccepted;
                         }
+                        TextShortcut::DeleteToStartOfLine => {
+                            TextInput::select_and_delete(
+                                self,
+                                TextCursorDirection::StartOfLine,
+                                window_adapter,
+                                self_rc,
+                            );
+                            return KeyEventResult::EventAccepted;
+                        }
                     },
                     Some(_) => {
                         return KeyEventResult::EventIgnored;