Support Alt+Backspace for word deletion in text areas

Add support for Alt+Backspace (Option+Backspace on macOS) to delete
entire words in text input areas, matching common text editor behavior.

Author: rtzll

pkg/gui/editors.go

@@ -8,6 +8,8 @@ import (
 
 func (gui *Gui) handleEditorKeypress(textArea *gocui.TextArea, key gocui.Key, ch rune, mod gocui.Modifier, allowMultiline bool) bool {
 	switch {
+	case (key == gocui.KeyBackspace || key == gocui.KeyBackspace2) && (mod&gocui.ModAlt) != 0:
+		textArea.BackSpaceWord()
 	case key == gocui.KeyBackspace || key == gocui.KeyBackspace2:
 		textArea.BackSpaceChar()
 	case key == gocui.KeyCtrlD || key == gocui.KeyDelete: