too many updates of the "outline" on branch 2.5.x

Hello LyX developers,

I have recently upgraded from LyX 2.3.2 to the 2.5.x branch.

I find that on a simple LyX document with a section and subsection,


            1 foo


              1.1 bar

        bar1
        bar2
        bar3

When putting the cursor after bar2 and typing on the return key, the outline is updated. Why? Right now I cannot try in 2.3.2, but it seems to me it was not the case. On a large file I am working on, I obtain some LyX crashes (without precise scenario, unfortunately), and I suspect that these frequent outline updates are linked to that.

To avoid these updates, it is enough to simply return  before updateViewNow() in GuiToc.cpp:

        void GuiToc::enableView(bool enable)
        {
             if (!enable)
                 // In the opposite case, updateView() will be called anyway.
                 return;
                 widget_->updateViewNow();
        }

I have not been able to find which method is calling enableView() again and again.

Am I right that there is a problem to solve here?

Thanks,

Julien

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