[LyX/master] Use more convenient MenuButtonPopup

[Jürgen Spitzmüller]

Am Samstag, den 18.07.2020, 00:33 -0400 schrieb Scott Kostyshak:
> This is a nice feature (added at 9495ff66 and modified here), and I
> agree that MenuButtonPopup is better. There is one thing that is a
> little annoying, which is that the arrow is not disabled if there is
> no
> item. We shouldn't disable the entire button because the action of
> the
> button is to paste from the *system* clipboard.
> 
> To reproduce what I'm talking about, start LyX, start a new document
> and
> click on the arrow next to the paste icon. The arrow lets you press
> it
> and looks like it will give something but never does. I actually
> expected something like the Edit > Paste Special submenu options to
> show, so I was confused.
> 
> The attached patch attempts to improve things. It only shows an arrow
> if
> there are items. It's not as nice as having a disabled arrow, but I
> don't know how to achieve that. Another disadvantage of the patch is
> that when it shows the arrow it takes up extra space on the toolbar
> so
> shifts the items to the right, which is unpleasant to the eye. There
> might be some style sheet padding magic that can be done to avoid the
> shift but I couldn't figure it out.
> 
> Any thoughts?

Actually I don't like any overpainting of style defaults. I prefer
having the arrow even though the history is empty.

Jürgen

> 
> Scott
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