Fix: Unnecessary status bar redraws when there is no news to show #8691
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Motivation / Problem
InvalidateWindowData with mode SBI_NEWS_DELETED was called on the
status bar when checking for a new item of news to be shown in the
ticker, even if there is no news queued and no change occurs.
Description
Now call InvalidateWindowData with mode SBI_NEWS_DELETED when deleting the current news ticker item, such that it
is not repeated every tick if there are no more news items.
Limitations
N/A
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.