fix $apply exception on showSidebar
make pageup key trigger fetch more lines
index: be extra careful to escape space in order to avoid uncollapsed space with white-space:pre
Merge pull request #489 from ailin-nemui/sidebar-apply-ex

fix $apply exception on showSidebar
Merge pull request #490 from ailin-nemui/pgup-fetch-lines

make pageup key trigger fetch more lines
Merge pull request #491 from ailin-nemui/escape-whitespace

index: be extra careful to escape space in order to avoid uncollapsed space with white-space:pre