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Fix creating video preview panel crashes if a video file is selected

Jean-Baptiste Mardellerequested to merge
work/mediaplayer-crash into release/25.08

To reproduce the crash:

  • Open Dolphin, disable information panel and close Dolphin
  • Re-open Dolphin
  • Select a video file
  • Enable information panel
  • Crash

Problem is that some elements of the MediaWidget panel are created when the widget is shown, in showEvent (m_seekSlider and m_topLayout), and these elements are called before being created.

This MR fixes 2 different crashes:

  • Crash creating panel when a video file is selected (call to m_seekSlider before its creation)
  • Crash creating panel when a video file is selected and autoplay enabled (call to m_topLayout before its creation)

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