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[Bug 1539011] Re: [regression] Window resizing is very choppy and stutters (border does not smoothly follow the mouse)

 

That was a design decision (made by developers, didn't actually go
through the design team).

First we were ignoring the mir surface size when resizing, so if it
didn't match or lagged behind the QML window size, the surface would get
stretched or squeezed to fit inside it.

Now the QML window size *always* match the Mir surface size. So the
resize "animation" will be as smoothly as the client application is able
to redraw its mir surface.

I think we need design input on how the window resize UX should look
like. Ie, how to deal with applications that are slow to relayout/redraw
and still have a smoothly "resize animation". Should we display some
sort of size hint such as that translucent orange rectangle in Unity 7?

** Also affects: ubuntu-ux
   Importance: Undecided
       Status: New

** Changed in: unity8 (Ubuntu)
       Status: Fix Released => New

** Branch unlinked: lp:~aacid/unity8/dash_backgroud_source_size_rework

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https://bugs.launchpad.net/bugs/1539011

Title:
  [regression] Window resizing is very choppy and stutters (border does
  not smoothly follow the mouse)

Status in QtMir:
  Invalid
Status in Ubuntu UX:
  New
Status in qtmir package in Ubuntu:
  Invalid
Status in unity8 package in Ubuntu:
  New

Bug description:
  Just tried Unity8 desktop for the first time since October and found
  some things don't work as well as before. One of them is window
  resizing, which is now every choppy and stuttering.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: unity8 8.11+16.04.20160122-0ubuntu1
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  ApportVersion: 2.19.4-0ubuntu1
  Architecture: amd64
  Date: Thu Jan 28 18:39:38 2016
  InstallationDate: Installed on 2015-12-03 (56 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151202)
  SourcePackage: unity8
  UpgradeStatus: No upgrade log present (probably fresh install)
  upstart.unity8-dash.log: Attempted to deliver an event to a non-existent window, ignoring.

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References