fix: Prevent duplicate submitter dialogs, and show submitter over Maya Window

[rmv]

What was the problem/requirement? (What/Why)

• clicking multiple times on the Deadline Submitter Icon would create multiple submitters
• Submitter window is created under the Maya window, unlike all the other Maya tools

What was the solution? (How)

• only create a submitter window when none is present, otherwise show the existing one
• pass along the Qt.tool flag to keep dialog on top of the main maya window

The submitter dialog stands somewhat in between a modal and non modal window, it's a modal command masquerading as a tool. All its stored data could become out of sync as the user edits and overwrites the underlying file or even loads a new file. Typically this is solved by adding a Refresh button to the tool.

I checked how this was handled in Deadline Classic to keep things as simple and useful/less confusing for users. In Deadline Classic this is implemented by keeping the data persistent and resetting the dialog when a new file is loaded.

File A is loaded:

• Dialog can be hidden or shown when the submitter button is pressed, data is persistent

After a new file load:

• Dialog can be refreshed by pressing the submitter button (settings reset, name set to new file)
• If Dialog is kept open the old settings are preserved, including the referenced file.

What is the impact of this change?

No more duplicates of submitter dialog, dialog stays on top.

How was this change tested?

unit tests passed,
test 1- load file, press button multiple times: only one submitter present, data preserved
test 2- load file, press button multiple times, modify data, close, press button multiple times: 1 submitter, data preserved
test 3- load file, press button multiple times, modify data, load file 2, press button multiple times: 1 submitter, data reset

Did you run the "Job Bundle Output Tests"? If not, why not? If so, paste the test results here.

No, does not impact job bundles.

Was this change documented?

SIM

Is this a breaking change?

No