My current theory is that when icons are sufficiently small or close to
the edge of the screen, it's too easy for the touch "gesture" to start
outside of the icon area (e.g. finger touching the display bezel). The
pressure then increases and the touch moves into the icon area. But
that's much the same as dragging your finger onto an icon. Try it in the
app grid and you'll get the same behaviour (icon thinks you're hovering,
not clicking).
Such touches may work more often in later Ubuntu releases just by virtue
of the actor/theme padding in ubuntu-dock. But I can reproduce the same
issue even in newer Ubuntu releases by sliding a finger onto an icon. So
I think that's probably the issue -- not really a bug but it feels like
a bug if you don't know the touch started outside the icon's sensitive
area.
Short term I just suggest good UI design - if it's a touch UI then make
sure the icons and buttons are big. Longer term we'll see what we can do
about making 20.04 more reliable, but we're busy supporting a lot of
different releases.
** Also affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Changed in: gnome-shell (Ubuntu Focal)
Importance: Undecided => Low
** Changed in: gnome-shell (Ubuntu Jammy)
Status: New => Fix Released
** Changed in: gnome-shell (Ubuntu Mantic)
Status: New => Fix Released
** Changed in: gnome-shell (Ubuntu Noble)
Status: New => Fix Released
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in Ubuntu.
https://bugs.launchpad.net/bugs/2042796
Title:
Ubuntu 20.04 The edge of the touchscreen is not sensitive
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