Created attachment 110537 [details] Testcase When a QComboBox is drawn in an itemview, the background is not cleared which results in unreadable text when the background text does not match the text in the combobox (see attachment). This happens with oxygen and with fusion style. The reason is, that the background is not cleared in Style::drawComboBoxComplexControl(). I'm not sure if it is a KDE or Qt bug but since all Qt styles work fine (maybe by accident because most of them draw the complete combobox rect every time) I decided to create a bug here. Also setting "widget->setAttribute(Qt::WA_OpaquePaintEvent, false);" in polish() doesn't help (although Qt's fusion style is doing this)...
Created attachment 110538 [details] Unreadable combobox
Hello, Thanks for reporting. Fusion is a Qt style (not a kde style). So that would make it a Qt bug. Also, looking at oxygen code, it seems there is some background drawn in drawComplexControl, provided SC_ComboBoxFrame is passed to the subcontrols. So I would suspect Qt not passing the right subcontrols to the method. Still I'll try investigate further. Does it also happen with breeze widget style ?
Sorry, mixed up fusion and breeze :) It works fine with fusion (qt) style since they're creating a QPixmap as cache and using this for drawing. It does not work with oxygen (for unknown reason - did not look at the sources). It does not work with breeze but it is fixed as soon as I fill the background in drawComboBoxComplexControl as it is done in the 'if (editable) .. { if (flat) ..' case.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!