[Qt-creator] ProjectWindow does not update project's displayName

[Konstantin Tokarev]

Hi Qt Creator developers,

I've found that ProjectWindow sets project name (i.e., title of its tab) only once when session is loaded or new project opened. So, if displayName is unavailable immediately after project loading (background parsing), or changes at run time, these changes won't get into ProjectWindow.

I propose to add signal displayNameChanged to Project class and extend DoubleTabWidget's API with renameTab(Project*, const QString &newName) method. Any thoughts/objections?

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Regards,
Konstantin