The Contents sidebar of KHelpCenter respects the double-clik-to-open-files setting in Input Devices > Mouse Controls. It shouldn't. Although, I assume, help documentation is made up of HTML files, KHelpCenter is not a file manager. Users should always browse through help content in Contents' tree view via single clicking. System Settings' navigation sidebar doesn't respect double-click setting, neither should KHelpCenter.
The contents sidebar is closer to a tree-view, which follows the single/double-click settings. Also systemsettings provides one. Yes, it could be made more tree-view like to make it less confusing, and/or an alternative view (like systemsettings) which follow that behavior could be created. I disagree that the current request, in its current form, should be implemented.
(In reply to Luigi Toscano from comment #1) > The contents sidebar is closer to a tree-view, which follows the > single/double-click settings. Also systemsettings provides one. > Yes, it could be made more tree-view like to make it less confusing, and/or > an alternative view (like systemsettings) which follow that behavior could > be created. I disagree that the current request, in its current form, should > be implemented. KInfoCenter's navigation sidebar is also a tree-view but doesn't respect that setting. Also System Setting's tree-view mode for navigation sidebar ignores that setting. KInfoCenter is the outlier here.
(In reply to Kayra Akman from comment #2) > KInfoCenter is the outlier here. I meant KHelpCenter.
System Settings's tree-view expands only on double click if you set double click.
Anyway, let my recheck the code.
(In reply to Luigi Toscano from comment #4) > System Settings's tree-view expands only on double click if you set double > click. I had meant the leaf items in System Settings. Non-leaf items expand with double-click but show leaf items in the main view as well. I expect leaf items in KHelpCenter to ignore the double-click setting.
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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!