D6184: restore horizontal scrollbar in the project manager plugin

[René J.V. Bertin]

rjvbb created this revision.
rjvbb added a project: KDevelop.
Restricted Application added a subscriber: kdevelop-devel.

REVISION SUMMARY
  An old comment in the ProjectManagerView ctor mentions a horizontal scrollbar, something I cannot remember having seen in the KDevelop5 project manager, and that I've sorely missed.
  
  This patch restores that feature, doing away with elided filename representation. The crucial change is setting `setStretchLastSection(false)` and the addition of a resizeEvent filter that sets the header's minimum section size appropriately. This was copied from Qt Creator's navigator widget implementation.
  
  The tooltip feature showing the full filename remains functional so I think (and hope) there is no need to provide a UI configuration option to allow users to select either the new or the old behaviour.

TEST PLAN
  tested on Mac and Linux

REPOSITORY
  R33 KDevPlatform

REVISION DETAIL
  https://phabricator.kde.org/D6184

AFFECTED FILES
  plugins/projectmanagerview/projectmanagerview.cpp
  plugins/projectmanagerview/projectmanagerview.ui
  plugins/projectmanagerview/projectmodelitemdelegate.cpp
  plugins/projectmanagerview/projecttreeview.cpp
  plugins/projectmanagerview/projecttreeview.h

To: rjvbb, #kdevelop
Cc: kdevelop-devel, geetamc, Pilzschaf, akshaydeo, surgenight, arrowdodger
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