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Description of problem:
Currently when running a Qt application under Gnome, Qt uses gtk style by default, but should use adwaita-qt style instead, which should work better and is supported and newly available in RHEL 7.3.

Created attachment 1152897 [details]
Patch used in Fedora

Fixed in qt-4.8.5-13.el7.

Created attachment 1170315 [details]
Comparison between GTK+ and adwaita during GNOME session

Created attachment 1170316 [details]
Comparison between GTK+ and adwaita during KDE session

TEST SCENARIO
1. On VM working with RHEL 7.2 having qt-4.8.5-11.el7
2. Log into KDE session
3. Launch dolphin, the application runs with GTK+ theme
4. On VM working with RHEL 7.3 having qt-4.8.5-13.el7
5. Log into GNOME session
6. Launch dolphin
    a) using GTK+ theme
    b) using adwaita theme
    The default theme is adwaita.
7. Log into KDE session
8. Launch dolphin
    a) using GTK+ theme
    b) using adwaita theme
    The default theme is adwaita.

RESULTS
Upgrading qt
    from: qt-4.8.5-11.el7
      to: qt-4.8.5-13.el7
has fixed the bug.

See screenshots from comparison between GTK+ and adwaita.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2236.html