[Breeze] [Bug 358224] New: breeze dark plasma look and feel: KDE4 applications are using mixed (light and dark) colors, rendering text unreadable

[Christian Stadelmann via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=358224

            Bug ID: 358224
           Summary: breeze dark plasma look and feel: KDE4 applications
                    are using mixed (light and dark) colors, rendering
                    text unreadable
           Product: Breeze
           Version: 5.5.3
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: plasma-devel at kde.org
          Reporter: dah5aeZe at genodeftest.de

I am running plasma 5.5.3 with breeze dark look and feel. No matter what I set
as desktop theme (Oxygen or Breeze) and no matter which widget style I choose
(Oxygen, Breeze, Fusion), some applications behave weird. They are partially
rendered with a dark breeze theme, partially rendered with a white theme that
looks like it were a Gtk 2.x theme. They are rendering fonts in lists in light
gray on very light gray. Icons are breeze symbolic icons, mostly using white
and very light colors, thus are not visible either.

I think (but I am not sure) that only KDE4/Qt4 applications are affected, but
KDE5/Qt5 applications are not. This theory is based on the following lists:

List of affected applications:
* Kleopatra
* KGpg
* KMail
* KSnapshot
* KDebugDialog
* Ark
* KOrganizer
* Okular
* Dragon Player
* KTouch
* showFoto
* digiKam
* Konqueror

List of not affected applications:
* dolphin (including preferences dialog)
* konsole (including preferences dialog)
* plasma itself including most of its widgets and widget preferences dialogs
* kwrite (including preferences dialog)
* KCalc
* KCharselect
* KAlgebra
* KSysguard
* Marble

Additional info:
This issue is somewhat similiar to bug #343369, but it affects all kinds of UI
elements, not just ComboBoxes in KCM.

I don't have any other dark desktop look and feel to test, so I can't make sure
this isn't a bug somewhere else, e.g. in Qt4's theming engine or KDE4's
widgets. Please reassign if you know better (you probably do).

Reproducible: Always

Steps to Reproduce:
1. start any of the applications listed above

Actual Results:  
Applications are partially rendered in a light, partially rendered in a black
theme. Some widgets have mixed themes, e.g. light fonts (from dark theme) and
light/white background (from light theme).

Expected Results:  
Applications should look consistent, having only one single theme.

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