D8991: Use kSqueezedTextLabel for the label text on the statusbar

[Ahmad Samir]

ahmadsamir created this revision.

REVISION SUMMARY
  Following up from https://phabricator.kde.org/D8927; use kSqueezedTextLabel for the label text on the statusbar:
  
  - This simplifies the code in updateLabelText()
  - Remove the eventFilter as it's not needed any more since kSqueezedTextLabel has a resizeEvent function
  - Specify a stretch factor, 1, for m_label, m_zoomSlider and m_spaceInfo, this prevents the changing of the width of m_label when the label text is updated from changing the widths of the zoomSlider and the spaceInfo widgets as that is a bit too jumpy.
  
  (Thanks to the code of konversation statusbar for the hint about using the stretch factor in addWidget()).

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D8991

AFFECTED FILES
  src/statusbar/dolphinstatusbar.cpp
  src/statusbar/dolphinstatusbar.h

To: ahmadsamir
Cc: #dolphin
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