Created attachment 174638 [details]
Test file with a sub calling another module's method

In 7.2 and master, the following sequence fails:

1. Define a module in a Basic shared library, containing a sub with an error:

Library "Standard" under "My Macros and Dialogs", Module "TestGlobalShared"

  Option Explicit

  Sub TestGlobalSub
    MsgBox UndefinedVar
  End Sub

2. In a document, define a Basic sub calling the said sub with error:

Document "TestGlobalSub.ODT">Library "Standard">Module "Module1"

  Option Explicit

  Sub Main
    TestGlobalShared.TestGlobalSub
  End Sub

3. Repeat this:
3.1. Double-click on "Main" under the document's "Module1";
3.2. Press F5;
3.2. Close the error message in the shared library's sub with error.

Repeating step 3 starts slowing down after several cycles; it depends on the could of modules shown in the IDE, but in the simplest case, when there are only a few modules, I see *some* delay after 7-8 repeats; significant delay on the next repeat; and huge delay on the next repeat. Repeating after that would hang.

It looks like some quadratic algorithm in place. It is a regression after commit https://git.libreoffice.org/core/+/d47ac2ebdb495b025eb26e17cbbe2509797c31f0 (Noel: could you please take a look? Maybe somewhere a typo crept in?).

Also in debug build, the second repeat brings an assertion failed at TabBar::InsertPage ("TabBar::InsertPage(): Page already exists").