[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #12 from Ferdinand B --- UPDATE: I tried to reproduce this bug on a system other than my own now, and found the following: - the bug only occurs on wayland - the bug only occurs with touchpads (e.g. a synaptics laptop touchpad) - the bug only occurs with Qt 5.14 or greater Reproducing System Config: - ArchLinux with sway, Qt 5.14 (my daily driver) - Fedora KDE Rawhide (tested with [[ https://kojipkgs.fedoraproject.org/compose/rawhide/Fedora-Rawhide-20200428.n.0/compose/Spins/x86_64/iso/Fedora-KDE-Live-x86_64-Rawhide-20200428.n.0.iso | nightly from 2020.04.28 ]]) note: this starts KDE in X11 by default, need to install `plasma-workspace-wayland`, exit the X11 session, and run `startplasma-wayland` on a tty to get KDE in wayland mode most likely, any system with Wayland and Qt 5.14 should do, but these are the two I tested it with. I didn't find a distro yet that ships a working wayland and Qt 5.14 on their live install media, so this convoluted testing setup is all I have as of now. Fedora Workstation Rawhide *should* work directly in the Live ISO, but the current nightly has a broken GDM and I haven't found a working one yet, so I tried the KDE variant. -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #11 from Kurt Hindenburg --- (In reply to Ferdinand B from comment #3) > Tested different scroll methods: > - via Shift+Up, Shift+PgUp -- works as intended > - via Mouse Wheel -- works as intended > - via Touchṕad Two-Finger scroll -- scrollbar appears unexpectedly Ok now I see this comment - I'll have to see if one my old laptops still works. -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #10 from Kurt Hindenburg --- I'm looking at this - currently can't reproduce - thanks for patch -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 dk.1997-f...@yandex.ru changed: What|Removed |Added CC||dk.1997-f...@yandex.ru -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #9 from Ferdinand B --- Added phabricator revision for this patch: https://phabricator.kde.org/D27110 -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #8 from Ferdinand B --- Created attachment 125627 --> https://bugs.kde.org/attachment.cgi?id=125627=edit QScrollBar diff between 5.13.2 and 5.14.0 I also attached a diff showing what changed in QScrollBar from Qt 5.13.2 to 5.14.0, which is what I suspect caused this bug to appear. I have tested latest konsole master with 5.13.2, 5.14.0, and 5.14.1, and the bug appears in both 5.14.0 and 5.14.1, but not in 5.13.2 -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 Ferdinand B changed: What|Removed |Added CC||theferdi...@gmail.com -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #7 from Ferdinand B --- Created attachment 125626 --> https://bugs.kde.org/attachment.cgi?id=125626=edit Workaround Patch I attached a patch that works around the issue by reapplying the scrollbar state (_scrollBar->setHidden(true)) every time an event is propagated to the scroll bar. It's not beautiful, but it works, and should be a NOP in cases where this bug does not occur. -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 Ferdinand B changed: What|Removed |Added Version|18.12.0 |master -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #6 from Ferdinand B --- UPDATE I have found where the scrollbar is set to visible: TerminalDisplay::wheelEvent(QWheelEvent) at TerminalDisplay.cpp:2717 calls _scrollBar->event(ev); QScrollBar::event(QEvent) at qscrollbar.cpp:490 calls QAbstractSlider::event(event) QAbstractSlider::event(QEvent) at qabstractslider.cpp:953 calls QWidget::event(e) QWidget::event(QEvent) at qwidget.cpp:8662 calls wheelEvent((QWheelEvent*)event) QScrollBar::wheelEvent(QWheelEvent) at qscrollbar.cpp:517 calls d->setTransient(false) QScrollBarPrivate::setTransient(bool) at qscrollbar.cpp:230 calls q->show() QWidget::show() at qwidget.cpp:7680 calls setVisible(true) This looks like some parts of the internals of Qt5 changed with Qt5.14 which now result in the scrollbar to be visible. I will try to compare with the source code of Qt 5.13, since the scrollbar started appearing only after I updated to 5.14. -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #5 from Ferdinand B --- UPDATE I tried to reproduce this issue today with latest konsole-git master, and try to find where this bug occurs: When starting scrolling for the second time using the touchpad, TerminalDisplay::wheelEvent propagates the event to QScrollBar::event on line 2717 (https://github.com/KDE/konsole/blob/09cc4f6bb97d9133f075bcc0cbf07506fb5f61c5/src/TerminalDisplay.cpp#L2717). In this case, the QScrollBar implementation further delegates to QWidget::event, which finally calls QWidget::setVisible(true). This results in the scroll bar becoming visible unexpectedly. -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #4 from Ferdinand B --- I tried to find the first version in which this bug occurs: Turns out this bug is not triggered by a specific konsole version. This bug is only observable when using Qt5 5.14, on Qt5 5.13, this bug does not exist. -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #3 from Ferdinand B --- Tested different scroll methods: - via Shift+Up, Shift+PgUp -- works as intended - via Mouse Wheel -- works as intended - via Touchṕad Two-Finger scroll -- scrollbar appears unexpectedly -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 --- Comment #2 from Ferdinand B --- EDIT: the bug doesn't seem to have anything to do with zooming. New reproducing Testcase: STEPS TO REPRODUCE 1. open konsole 2. set scrollbar to 'hidden' 3. get some lines into the scroll buffer (e.g. `yes | head -n100`) 4. scroll a bit (using the touchpad) 5. stop scrolling 6. scroll a bit (using the touchpad) 7. scrollbar appears on the left side of the window -- You are receiving this mail because: You are watching all bug changes.
[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad
https://bugs.kde.org/show_bug.cgi?id=415508 Ferdinand B changed: What|Removed |Added Summary|Scrollbar set to 'hidden' |Scrollbar set to 'hidden' |reappears sometimes when|reappears when scrolling |zooming then scrolling |twice via touchpad -- You are receiving this mail because: You are watching all bug changes.
