[Bug 31434] [Dapper] Moving tabs sometimes causes flickering

[Trouilliez vincent]

Public bug reported:
https://launchpad.net/malone/bugs/31434

Affects: gedit (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
I noticed that when I have several documents opened at the same time,
and I grab the tab of one of the documents to move it around, the tab
sometimes "flicker"/hesitates, as you cross the boundary between two
tabs.

I tried to narrow it down, and found a way to reproduce the problem. I
looks like the problems is related to the width of the tabs (hence the
length of the file names) relative to each other:

1) create 3 new (empty) documents, and call them for example A.txt,
AA.txt nad AAA.txt, so that the tabs will all be of a different length.

2) grab "A.txt", and sloolwy move it's tab : you normally see some
flickering.

3) grab "AAA.txt" and do the same : there is no fickering.

It seems that the flickering only occurs, if the tab that you are
moving, is narrower/shorter than the tab you are trying to jump over so
to speak.

For example switching from  A - (AA) - AAA to (AA) - A - AAA will cause
no flicker, but switching to A - AAA - (AA) will.