ID 375226 - The 'show more' button can be added infinitely when clicked from the left pane.

Problem Summary:
The 'show more' button can be added infinitely when clicked from the left pane.

Customer reported version:
modo.12.1v1

Customer reported platform:
windows10

Steps to reproduce:
1) From Modo, hover the mouse on the window border between the viewport and the left panel.

2) Click + drag the mouse inwards to the left of the screen to shrink the panel.

3) Observe a 'show more' button (>>) appear for each sub-menu item.

4) Click a 'show more' button (>>) and view another appear.

5) Click the second 'show more' button (>>), and continue to do so for each subsequent menu item.
 

Reproduced by Support in:
Modo 12.2v1 - Windows 10, macOS 10.13
Modo 12.1v2 - Windows 10
Modo 12.1v1 - Windows 10, macOS 10.13 - regressed

Unable to reproduce bug in:
Modo 12.0v1 - Windows 10, macOS 10.13

Earliest version tested:
Modo 12.0v1 - This issue no longer appears in this version and has regressed
 

Expected behavior:
The hidden menu items should appear without additional sub-menu 'show more' buttons.

Actual behavior:
An additional sub-menu 'show more' button appears instead of showing the hidden items.