Fix model updates in RunnerMatchesModel

Authored by davidedmundson on Jan 3 2019, 11:47 AM.

Description

Fix model updates in RunnerMatchesModel

Summary:
RunnerMatchesModel is backed by a list. When this list changes
RunnerManagerModel add/removes the new number of rows then called
dataChanged on everything that remained.

It's a common pattern, but not a great one. Especially with QtQuick
where moving a delegate is faster than updating all the properties of an
existing one - unfortunately I can't find a nice solution to do this
properly in linear time.

The problem with the current code is we update the entire list in the
insert/remove rows. This is a violation of the model rules as we're
updating rows outside the rows listed inside begin/remove rows.

It works, but Qt's model test fails.

We also have a lot of duplicates of a crash in QtQuick after runner
model changes, bug 369430. I think it could be related, but can't
prove anything.

This patch updates the rows that exist in both the before and after
models before adding/removing the remaining rows.

BUG: 402439

Test Plan:
Added Qt model tester in https://phabricator.kde.org/P283
It now passes.

Reviewers: Plasma, hein

Reviewed By: Plasma, hein

Subscribers: hein, apol, plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D17725

Details

Committed
davidedmundsonAug 15 2019, 8:58 PM
Reviewer
Plasma
Differential Revision
D17725: [RFC] Fix model updates in RunnerMatchesModel
Parents
R119:ac407487d2f0: SVN_SILENT made messages (.desktop file) - always resolve ours
Branches
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Tags
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