It's not just a black background that hides it.  There must be a css 
selector for it, mustn't there? 

On Wednesday, April 3, 2024 at 10:56:16 AM UTC-4 Edward K. Ream wrote:

> On Wednesday, April 3, 2024 at 4:54:32 AM UTC-5 Edward K. Ream wrote:
>
> It took me a while to understand what the @button node is doing.
>
> ...
>
> I'm satisfied neither with #407 
> <https://github.com/leo-editor/leo-editor/issues/407> nor with the 
> script. I would prefer some ways of splitting the icon bar at specific 
> places. I have just created #3851 
> <https://github.com/leo-editor/leo-editor/issues/3851>.
>
>
> Alright, I think I understand the bounds of the problem.
>
>
> Googling shows that the QToolbar class has inherent limitations. There is *no 
> way* to split QToolButton widgets into separate rows. Happily, the 
> toolbar shows an *extension icon* on the far right when there are too 
> many buttons. Clicking this icon will show the remaining widgets on 
> separate lines. The newly revealed icons *remain visible* until the user 
> clicks the extension icon again.
>
>
> I never noticed this behavior before. Worse, my dark theme obscured the 
> extension icon! I've corrected that bug by giving the icon a lighter 
> background color.
>
>
> *@button expand-toolbar*
>
>
> This script needs more explanation. The script creates a button that 
> duplicates the purpose of the extension icon. The script (@button node) 
> does nothing if everything in the icon bar is already visible.
>
>
> The script simulates a *single* keypress (and release) on the extension 
> icon. Therefore, the newly revealed icons will *remain visible* until the 
> user presses the button (or the actual extension icon).
>
>
> The test:  if w.objectName() == 'qt_toolbar_ext_button':
>
>
> looks for the name that Qt assigns to the expansion icon. This name *has 
> nothing to do with the headline of the @button node!*
>
>
> *Summary*
>
>
> At long last, I understand the inherent limitations of the QToolbar 
> widget. There seems to be no way to split its contents into separate 
> (always visible) lines.
>
>
> Otoh, the extension icon shows all widgets when clicked and *continues to 
> do so* until clicked again. This behavior is good enough for most 
> purposes.
>
>
> I've corrected my dark theme to show the extension icon. The icon must not 
> have a black background.
>
>
> The given @button script works, but it needs some explanation. I'll amend 
> #3851 <https://github.com/leo-editor/leo-editor/issues/3851> accordingly.
>
>
> Edward
>

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