[launcher] Flicking the list fast exhibits unpleasant visual artifacts
Bug #727082 reported by
Olivier Tilloy
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| unity-2d |
Invalid
|
High
|
Olivier Tilloy | ||
| unity-2d (Ubuntu) |
Expired
|
Undecided
|
Unassigned | ||
Bug Description
Steps to reproduce:
1) Press the left mouse button on any tile in the applications list and start dragging up or down fast to flick the list
2) Stop the movement sharply without releasing the mouse button
Notice that sometimes a number of tiles are not drawn at the position they are supposed to be. This is not always observable (but rather easily reproducible), and it doesn’t happen when flicking slowly/gently. It doesn’t happen either when use the mouse scrollwheel to flick the list.
I’m attaching a screenshot of the issue.
Revision history for this message
| Olivier Tilloy (osomon) wrote | #1 |
Revision history for this message
| Olivier Tilloy (osomon) wrote | #2 |
| Changed in unity-2d: | |
| importance: | Undecided → High |
| milestone: | none → 3.8 |
| Changed in unity-2d: | |
| milestone: | 3.8 → 3.10 |
Revision history for this message
| Olivier Tilloy (osomon) wrote | #3 |
| Changed in unity-2d: | |
| milestone: | 3.10 → none |
Revision history for this message
| Olivier Tilloy (osomon) wrote | #4 |
| Changed in unity-2d: | |
| assignee: | nobody → Olivier Tilloy (osomon) |
Revision history for this message
| Florian Boucault (fboucault) wrote | #5 |
| Changed in unity-2d: | |
| status: | New → Incomplete |
| Changed in unity-2d (Ubuntu): | |
| status: | New → Incomplete |
Revision history for this message
| Launchpad Janitor (janitor) wrote | #6 |
| Changed in unity-2d (Ubuntu): | |
| status: | Incomplete → Expired |
| Changed in unity-2d: | |
| status: | Incomplete → Invalid |
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I already spent a bit of time investigating the issue, and it appears that when the problem happens, the actual y coordinates of the items are correct, but their visual representation are not refreshed until the mouse cursor is moved further.
Whether that is a bug in Qt/QML or something we can fix in our implementation, I don’t know.