Document setStyleSheet for script Dialog widgets

[dogboydog]

I didn't realize that this method existed but it seems you can do a lot with this

Example:

 var style = `
    background-color : #0f1314;
    color : #a9a0f5;
    `;
    dialog.setStyleSheet(style);

Can produce:

I found this because a user was asking if the foreground and background colors could be changed for dialogs.
I added links to the documentation but I am not sure if there are limitations of what stylesheet features can be used versus what is documented in the Qt doc.

[eishiya]

Rather than "adjust the stylesheet", I think better wording would be "set the stylesheet", since the entire stylesheet is replaced.

[bjorn]

Rather than documenting setStyleSheet here, I think we could derive Dialog from Qt.QWidget. The minimumWidth and minimumHeight properties could be moved there as well, since they're QWidget properties after all and should work on all widgets you can add to the dialog as well.

[bjorn]

Oh, btw, I think this should just be documented as a styleSheet : string property.

[dogboydog]

Done thanks

[bjorn]

I added links to the documentation but I am not sure if there are limitations of what stylesheet features can be used versus what is documented in the Qt doc.

Most of that stuff should be supported. However, I'm in the process of implementing a custom style for Tiled (#3597), and unfortunately the QStyle documentation notes:

Warning: Qt style sheets are currently not supported for custom QStyle subclasses. We plan to address this in some future release.

(and I think this warning has been there for many years, since QStyle barely changed since Qt 4)