backspaceWord method
Deletes word before cursor (Ctrl+Backspace behavior).
Returns true if any characters were deleted.
Implementation
bool backspaceWord() {
if (_cursorPosition == 0) return false;
final t = text;
var pos = _cursorPosition - 1;
// Skip trailing whitespace
while (pos > 0 && t[pos] == ' ') {
pos--;
}
// Delete until start of word
while (pos > 0 && t[pos - 1] != ' ') {
pos--;
}
final before = t.substring(0, pos);
final after = t.substring(_cursorPosition);
_buffer.clear();
_buffer.write(before);
_buffer.write(after);
_cursorPosition = pos;
return true;
}