Backport of #13295 to release/9.0

Fixes #13071

Proposed changes

• revert PR#12431 , use another approach to fix Issue#12440
• Introduce EditMouseDown flag in PropertyGridView.flag. This flag is on when the TextBox in the PropertyGrid.GridEntry is focused and is off when editing is done.
• The cause of Issue#12440 is that after editing is done, GridEntryAccessibleObject will raise AutomationFocusChangedEvent

GridEntry.GridEntryAccessibleObject.cs

        ...
        internal override void SetFocus()
        {
            if (PropertyGridView is null || !PropertyGridView.IsHandleCreated)
            {
                return;
            }

            base.SetFocus();

            RaiseAutomationEvent(UIA_EVENT_ID.UIA_AutomationFocusChangedEventId);
        }

So in order to not let TextBox loose rectangle, add conditions to that event to exclude two cases:

1. when InPropertySet is on
2. when EditMouseDown is on

Regression?

• Yes

Screenshots

Before

GetProperties method didn't get invoked described in #13071

After

Test methodology

• manually