InRibbonGallery DropDown not layouting correctly

[MenzenJ]

In f2c89af (current revision in develop branch) the InRibbonGallery DropDown is not sizing and placing its children correctly.

This behavior has changed since version 6.1.0.
I guess this was unintended, thats why i created this issue.

Steps to reproduce:

1. Open ShowCase App
2. Change to "Gallery"-Tab
3. Open any InRibbonGalery DropDown
4. Resize the drop down
5. See items centered and "jumping elements" on initial resize

• Items centered see any grouped InRibbonGallery DropDown
• To make the jumping more visible change the MaxItemsInDropDownRow to 1 for the last InRibbonGallery in the "Without Grouping" RibbonGroupBox

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Environment

• Fluent.Ribbon Commit f2c89af
• Windows 10
• .NET Framework 4.6.2

[batzen]

That's of course not intended ;-)

[DynamicField]

666 😓

[batzen]

This issue was introducing by 82351d8 and 8b458b1.
Now i just have to find a way to fix all at once...

[batzen]

As a reference for me #542