ID 376736 - When the Viewer has 200 or more layers, the layer dropdown groups the layers into pairs, and creates sub menus to access them

Problem summary
When the viewer has 200 or more layers, the layer dropdown groups the layers in pairs, and creates sub menus to access them.

Customer reported version
nuke.11.2v5

Customer reported platform

Steps to reproduce

1) Open Nuke

2) Create a CheckerBoard node

3) With the CheckerBoard node selected, run the following code:

for x in xrange(197):

layname = 'lay' + str(x)

lay = nuke.Layer( layname, [ layname + '.red', layname + '.green', layname + '.blue', layname + '.alpha'] )

shuff = nuke.createNode("Shuffle")

shuff["out"].setValue(lay.name())

4) Connect the Viewer to Shuffle196, the menu looks normal:

5) Connect the Viewer to Shuffle197, the menu has grouped the layers, and created sub menus to access them:

Using the below code to count the layers shows that 200 layers are need for this issue to occur:

allLayers = nuke.layers(nuke.activeViewer().node().input(nuke.activeViewer().activeInput()))

print len(allLayers)

Reproduced by support
This bug has been reproduced in:

Nuke 11.3v1 - Windows 10 - CentOS 6.9 - MacOSX 10.13

Nuke 11.2v1 - Windows 10

Nuke 11.1v1 - Windows 10

Nuke 11.0v1 - Windows 10

Nuke 10.5v1 - Windows 10

Nuke 10.0v1 - Windows 10

Nuke 9.0v1 - Windows 10

Nuke 8.0v1 - Windows 10 - CentOS 6.9 - MacOSX 10.13

Earliest version tested
Nuke 8.0v1 - This issue appears to be in all versions of the product

Expected behaviour
For the menu to be consistent 

Actual behaviour
It adds sub menus when you have 200 layers or more