How does the PDF viewer get the focus?
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To compare PDF documents I open them side by side in two tiled tabs, then I send them the same input to move them the same amount.
I noted than if I use the Vivaldi keyboard shortcut to move to the Next-tab or Prev-tab the correct tab gets the indicator that it has focus, while the content doesn't, or at least pressing "up", "down", etc... is ignored.
Why is it so? Can I do something differently to get keyboard shortcuts to make the documents obey to my inputs?
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@DavidBevi Running Linux here but have the same problem testing this. Only help I found is to use "shift-tab" when switching to the next Tab with pdf. Then you can use the arrow keys for up/down. Focus seems to be elsewhere that's for sure. If you press Tab you'll see it start marching across the controls starting with the meatball in top left corner...