[Libreoffice-bugs] [Bug 144183] New: Basic IDE hangs after several error messages

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=144183

            Bug ID: 144183
           Summary: Basic IDE hangs after several error messages
           Product: LibreOffice
           Version: 7.2.0.4 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: BASIC
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: mikekaganski at hotmail.com
                CC: noelgrandin at gmail.com

Created attachment 174638
  --> https://bugs.documentfoundation.org/attachment.cgi?id=174638&action=edit
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").

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