Fix #6441.

Add check for the line number to be positive.
Check for valid codeSnippet.
Fix several visual issues with find result highlighting:
- Reduce width of scrollbar tickmarks to match new, narrower custom-themed
scrollbars (should also look better on Mac, where the tickmarks were already
too wide)
- Fix bug where showing/hiding a bottom panel didn't update the positioning
of scrollbar tickmarks
- Results that span multiple tokens showed little orange dots in the text
highlight between tokens (due to repeated corner rounding). There are still
faint lines between tokens (due to box-shadow), but they're much fainter.
maintain folder expanded state when last child is deleted
Use jstree open_node in corner case #6474 where renaming the only file in a directory caused duplicate tree nodes to appear
simplify state validation for directories
find in files stays in a single line
Fixes #6531 so that folder-based overrides work correctly.

This change queues up messages from Scopes as they are being added and
sends them out once they are fully added.
Updated by ALF automation.
Changes QuickView over to the new preferences system
Merge pull request #6533 from adobe/alf_localization

ALF Automation
Merge pull request #6532 from adobe/dangoor/6531-folder-overrides

Fixes #6531 so that folder-based overrides work correctly.
Do not set display line number for invalid lines
Merge pull request #6442 from busykai/fix-6441

Fix #6441.
Merge pull request #6495 from adobe/jasonsanjose/issue-6483

Maintain folder expanded state when last child is deleted
Merge pull request #6522 from adobe/jasonsanjose/issue-6474

Prevent duplicate tree nodes when renaming the only file in a directory
Merge pull request #6478 from adobe/pflynn/find-highlighting-tweaks

Fix several visual issues with find result highlighting:
Merge pull request #6534 from adobe/dangoor/quickview-pref

Changes QuickView over to the new preferences system
Merge pull request #6529 from ishanatmuz/followupFor#6348

find in files stays in a single line
comment out use of defaultExtension pref to avoid problems with ScopeManager