Where do the extra 9 pixels come from in FP.WindowBounds?

[srlm]

In Windows 11, with all the scrollbars, menus, and button bars turned off, I expected the offset between panel bounds height and window bounds height to be the thickness of the titlebar. But the title bar is 32 pixels. Why does window bounds report an additional 9 pixels? 

(LabVIEW 2020)

[zou · Accepted solution]

In short, edges.

This is from Microsoft.  All windows like that.  Not just LabVIEW front panels.

Try move cursor slowly across edge, see when it change from pointer cursor to size cursor.

[srlm]

Ah. They count the operation boundary not the visual one. 

Thank you for the explanation. I'm hoping I can take that fixed difference into account and still compute the titlebar thickness for different font sizes on different versions of Windows.