Indentation is incorrect when adding a new slot after configuring indent size in TextEditor

STEPS:

• Preferences -> Text Editor -> Behaviour: Tab size:2 & Indent size:2
     Click Apply

• Go to Preferences -> Text Editor -> C++.  
• Observe that in General tab, the Tab size is shown as  4.

• Open / Create a project with mainwindow form
• Open the mainwindow.ui and add a push button
• Click on "Go to slot" , which will add the slot function

OBSERVED:

• The cursor is still 4 spaces from the start of line

EXPECTED:

• The cursor should be 2 spaces from the start of line
• When setting 'Preferences -> Text Editor -> Behaviour: Tab size:2 & Indent size:2', it should reflect in Text Editor -> C++ also