calc: allow to use shortcut ctrl+Enter in comments

[meven]

this.map.mention can be unset in particular in calc.

Amends #10383

Change-Id: I8dba5d36f20d6fe3bf0df9b9fa15a98b70b51eaa

• Resolves: #
• Target version: master

Summary

In calc > insert a comment > type some text > hit Ctrl+Enter

Expected:
The popup closes, the comment is saved.

Checklist

• I have run make prettier-write and formatted the code.
• All commits have Change-Id
• I have run tests with make check
• I have issued make run and manually verified that everything looks okay
• Documentation (manuals or wiki) has been updated or is not required

[vmiklos]

Looks good, thanks.

Nits:

• it would be good to be more verbose in the commit message. Ideally you would describe what's the purpose of this 'map.mention' (that's the at-completion in Writer, correct?) in Writer. Also describe how this failed (I assume this is always undefined in Calc/Impress?). Finally describe how the new state is meant to keep the old use-case fixed, while fixing the new use-case.
• Would it be possible to cover this fix with a cypress test?

[meven]

it would be good to be more verbose in the commit message. Ideally you would describe what's the purpose of this 'map.mention' (that's the at-completion in Writer, correct?) in Writer. Also describe how this failed (I assume this is always undefined in Calc/Impress?). Finally describe how the new state is meant to keep the old use-case fixed, while fixing the new use-case.

Too late to complete now.

Would it be possible to cover this fix with a cypress test?

I think so. Especially easy if inserting comment is already tested.