Style tag loading is very slow for a large number of style tags

Steps to reproduce:

  • open Inkscape
  • open sample file seq_test.svg which contains a lot of style tags

What happened?

  • Inkscape hangs.

What should have happened?

The file is opened.

Timing inkview on that file, I get with a stopwatch:

style tags average time (3 attempts, rounded to full integer)
1 5s
... 5s
19 5s
20 6s
21 12s
22 30s
23 50s
25 aborted after 2 min

Inkscape Version and Operating System:

  • Inkscape Version: 1.1-dev (6b4d57f, 2020-04-01)
  • Operating System: Windows 10
  • Operating System version: 10.0.18362