https://bugs.documentfoundation.org/show_bug.cgi?id=152411

            Bug ID: 152411
           Summary: Gtk-CRITICAL: assertion 'GTK_IS_TREE_MODEL
                    (tree_model)' failed when switching element lists in
                    Math
           Product: LibreOffice
           Version: 7.4.3.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Formula Editor
          Assignee: [email protected]
          Reporter: [email protected]
            Blocks: 103182, 103461

Steps to reproduce:

1. Launch Math from command line, with e.g. libreoffice7.4 --math
2. Switch element lists from either the sidebar (all versions) or the Elements
panel (up to version 7.4): assertion 'GTK_IS_TREE_MODEL (tree_model)' failure
message shown in command line.
3. Insert an element into the formula
4. Change element list again: assertion failed again

Full Gtk-CRITICAL message:

(soffice:25781): Gtk-CRITICAL **: 12:34:11.070: gtk_tree_model_get_iter:
assertion 'GTK_IS_TREE_MODEL (tree_model)' failed

Note that the assertion failure does not repeat unless an element has been
inserted from the panel into the formula.

Versions:

Version: 7.4.3.2 / LibreOffice Community
Build ID: 1048a8393ae2eeec98dff31b5c133c5f1d08b890
CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: threaded

Version: 7.5.0.0.alpha1+ (X86_64) / LibreOffice Community
Build ID: da3dd48eaf9086f8ab28d6a6655f9a638e51433a
CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: threaded

Not reproduced in:

Version: 7.3.7.2 / LibreOffice Community
Build ID: e114eadc50a9ff8d8c8a0567d6da8f454beeb84f
CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: threaded

-> Regression.

Not reproduced in:

Version: 7.5.0.0.alpha1+ (X86_64) / LibreOffice Community
Build ID: da3dd48eaf9086f8ab28d6a6655f9a638e51433a
CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: kf5 (cairo+xcb)
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: threaded

-> GTK VCL-specific.


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=103182
[Bug 103182] [META] GTK3-specific bugs
https://bugs.documentfoundation.org/show_bug.cgi?id=103461
[Bug 103461] [META] Elements pane/dock/window/sidebar in Math
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