Part 1 - general logging - tested. No issues found. Waiting for part 2 and part 3 of the test plan.

Happens fatal error in the line

Added fallback to DB cache when Memcache is not available.

Changed SQL expression formatting

Improved SQL expression formatting, updated test plan.

1. Installation is possible only with PHP v.7 because of "random_int" function, used in added code.
2. After installation with PHP v.7.2 new "SecurityHmacKey" and "SecurityEncryptionKey" settings were added normally, but test.php resulting in exception: -
   

1. I do not understand where is improvement. I see, that before icon was 1 pixel over checkox. Now it is 1 pixel under checkbox, and I do not see any issue related to row count in "before" case
   

Made requested code fixes. TODO - test plan changes.

Condition moved one level up.

Added missing phrase translation.

GROUP_CONCAT usage replaced with concatenation on php level.

Improvement for calculations result caching

No, this error is not related to current task changes.

No strlen error in debugger from changed ValidateRange method. 'FirstName' test value detected as invalid in other validation method (ValidateType) and not passed to ValidateRange method.

Done refactoring.

Fixed bug in recursive call parameter.

Made filter out all records when incorrect date entered.

Made "Modified By" username output in place of e-mail in the edit forms.

Changed "Modified" output on topic edit form.

1. Fixed phrase module.
2. Fixed CS errors.

Tested - this change does not affect CKEditor style dropdown in the other themes (default, simple). While testing, cms.css was changed to have width 300px. In the advanced theme dropdown become about square (300x300), and dropdowns in the other themes (default, simple) has no changes.

Testing in progress, not finished. Cant normally upgrade from 5.1.c to 5.2.x. -

Patching to 5.2.2-B2 version:

Hunk #1 FAILED at 801.
1 out of 1 hunk FAILED -- saving rejects to file /tmp/skin_css_8ikYD3.rej

Removed old Id hardcoding.

Tested, all tests passed, excepting Test2 in part "value after T_ADD_VAR[test]: haven't changed" - this value changed in this test
https://www.screencast.com/t/25QIBxii

Part 1 test not passed. - https://www.screencast.com/t/n8hWHlZ8zes

Fixed notices.

Made all requested improvements.

Today written locally all requested changes code, not tested, stored to Shelf.

Made requested changes to category helper.

At part 3 resulting thumbnail size was not 100x100, but was 120x120.
At part 4 resulting thumbnail size was not 75x100, but was 90x120 (screenshot added for this case).

Reverted change of Enabled field name.

All works properly, but test plan may be corrected:
Part 1, 13 - may be "confirm, that in Console 3 messages about change event appeared (for 2 option checkboxes + select all itself)" - because by previous part of the plan 2 options were unchecked.

Tested with system log enabled. No deprecation warnings found. All system log messages, got when testing, displayed on screenshot -

All tests passed, excepting creating records about deprecated calls in the System Log - on tests such records never created. System Log is empty.

All right, but when upgrading from 5.1.x to 5.2.x with debugger enabled, got lot of error messages on all installation steps from 1st to 6th. Like "Table SystemLog doesn't exist"

Today made locally all requested changes, left testing by plan.