Fix bracketed paste and scrolling bug

[tompng]

Reproduce

Pasting 10 lines of code into terminal with screen height = 5

Actual screen (Reline 0.6.0)
irb(main):001> 1.tap do
irb(main):002>   2
irb(main):003>   3 
irb(main):004>   4
irb(main):005>   5█

Expected screen (Reline <= 0.5.12)
irb(main):006>   6
irb(main):007>   7
irb(main):008>   8 
irb(main):009>   9
irb(main):010> end█

2. If you press Ctrl+C, irb crashes with the error below. Pressing other key will update the screen to the expected result.

/Users/tomoya.ishida/.rbenv/versions/3.4.1/lib/ruby/3.4.0/reline/io/ansi.rb:289:in 'String#*': negative argument (ArgumentError)

    write "\n" * x
                 ^
	from /Users/tomoya.ishida/.rbenv/versions/3.4.1/lib/ruby/3.4.0/reline/io/ansi.rb:289:in 'Reline::ANSI#scroll_down'
	from /Users/tomoya.ishida/.rbenv/versions/3.4.1/lib/ruby/3.4.0/reline/line_editor.rb:192:in 'Reline::LineEditor#handle_interrupted'
	from /Users/tomoya.ishida/.rbenv/versions/3.4.1/lib/ruby/3.4.0/reline/line_editor.rb:169:in 'Reline::LineEditor#handle_signal'

Reason

# Set pasting=true because the content of bracketed_paste is not read from stdin
line_editor.set_pasting_state(io_gate.in_pasting?)

inputs.each do |key| # inputs.size is always 1 if you don't have custom .inputrc file
  ...
  key = Reline::Key.new(io_gate.read_bracketed_paste, :insert_multiline_text) # everything is all read from stdin
  ...
  # Calls update with pasting state = true. In this case, scroll_into_view is skipped (Bug1)
  line_editor.update(key)
end

# set pasting state to false
line_editor.set_pasting_state(io_gate.in_pasting?)
# renders the screen with cursor out of the screen. rendered_screen.cursor_y will be larger than screen height (Bug2)
line_editor.rerender

Fixes

Bug1: scroll_into_view wrongly skipped, is fixed by the change in lib/reline.rb
Bug2: Fixed in lib/line_editor.rb, in case of other unknown bug that cause calling render with cursor position out of the screen.