Qt Installer Framework graphical glitch when editing repositories

When editing a Temporary or User Defined repository in the Repositories tab of the Settings dialog of the Qt online installer or Maintenance tool of any project built with the Qt Installer framework, the previously enter text remains displayed in yellow underneath the newly entered text displayed in white, making it difficult to see the newly entered value. This behavior is observed in all three columns, Username, Password and Repository.

To reproduce,
1. Run the Qt online installer
2. Click on the settings buttons in the lower left hand corner
3. Select the "Repositories" tab in the Settings dialog
4. Click on "Temporary repositories"
5. Click the "Add" button
6. Enter "testing" and press the Enter key
7. The Repository column displays "http://testing" in yellow text
8. Double click on "http://testing"
9. The Repository column displays "http://testing" in both white and yellow text
10. Edit the repository URL to "tempRepo"
11. The previously entered text "http://testing" is displayed in yellow underneath the newly entered text "tempRepo" which is displayed in white

Additionally, it is not easy to determine which text entry has been selected as the selection is not visible, for instance double clicking on the entry and pressing the Backspace key leads to deletion of the displayed white text while the previously entered yellow text remains.