Bug report #15894

Transaction groups + translation with node tool issue

Added by Hugo Mercier over 7 years ago. Updated over 5 years ago.

Affected QGIS version:2.18.0 Regression?:No
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:end of life
Crashes QGIS or corrupts data:No Copied to github as #:23812


A problem arises with the following combination:
- a PostGIS line layer
- "transaction groups" enabled
- multi thread rendering

In this particular case, when trying to displace a segment with the node tool, only one vertex is actually displaced. When disabling the multi thread rendering, it works fine.

See the picture for illustration.

The node tool edit sends two vertex updates when displacing a line segment. It seems that when the multi thread rendering is enabled, the second vertex update sends a new geometry based on the initial geometry (not the one after the first vertex update as it should be). Probably some geometry cache that is not cleared ...

on 2.18 Linux

bug_node_tool.jpg (29.4 KB) Hugo Mercier, 2016-11-25 04:45 AM


#1 Updated by Hugo Mercier over 7 years ago

#2 Updated by Giovanni Manghi about 7 years ago

  • Regression? set to No
  • Easy fix? set to No

#3 Updated by Regis Haubourg almost 7 years ago

  • Description updated (diff)

Is it still true with more recent changes to the node tool?

#4 Updated by Giovanni Manghi almost 7 years ago

  • Status changed from Open to Feedback

#5 Updated by Regis Haubourg over 6 years ago

  • Status changed from Feedback to Open

Still true in QGIS 2.18.16

#6 Updated by Regis Haubourg over 6 years ago

Master not affected with full vertex editor refactor. The fix is only for QGIS2 then

#7 Updated by Giovanni Manghi over 5 years ago

  • Resolution set to end of life
  • Status changed from Open to Closed

End of life notice: QGIS 2.18 LTR


QGIS 3.4 has recently become our new Long Term Release (LTR) version. This is a major step in our history – a long term release version based on the massive updates, library upgrades and improvements that we carried out in the course of the 2.x to 3x upgrade cycle.

We strongly encourage all users who are currently using QGIS 2.18 LTR as their preferred QGIS release to migrate to QGIS 3.4. This new LTR version will receive regular bugfixes for at least one year. It also includes hundreds of new functions, usability improvements, bugfixes, and other goodies. See the relevant changelogs for a good sampling of all the new features that have gone into version 3.4

Most plugins have been either migrated or incorporated into the core QGIS code base.

We strongly discourage the continued use of QGIS 2.18 LTR as it is now officially unsupported, which means we’ll not provide any bug fix releases for it.

You should also note that we intend to close all bug tickets referring to the now obsolete LTR version. Original reporters will receive a notification of the ticket closure and are encouraged to check whether the issue persists in the new LTR, in which case they should reopen the ticket.

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