ScrollIntoView centers horizontally enen without Columns defined #776
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This PR extends ScrollIntoView to scroll horizontally even when no Columns are defined. The changes are minimal and have been tested in production code for years.
This is handy. For example the following picture shows you a VirtualStringTree decendent VirtualExplorerTree.
After clicking on the directory chardet, it is scrolled into view centered without the user having to scroll horizontally.
Horizontal centering happens only when toCentreScrollIntoView is set and the behavior is the same as if a single column was defined. The behavior is identical to the current code if Columns exist.