Lazarus IDE problem?

[BrunoK]

These are my steps:
- etc ...

 These are my steps:
- Windows 10, 64-bit IDE (Laz/main + fpc 3.2.2)
- IDE from yesterday's git, clean rebuild of the IDE with
  -MObjFPC -Scghi -O1 -OoREGVAR
  -gw3 -gl -Xg  -WG-
  Target dir $(ConfDir)\
 I dont think those points are important and I do a clean of the units by deleting the $(ConfDir)\units dir.
 
Enter lazarus
- The last project gets shown.
- Project / New project ... / Application
 - Now have Unit1 shown.
 - Touch Unit1, add a space before 'unit unit1;'

- Project / New project ... / Application
 - Asks : Save changes to project project1?
 - Answer : Yes
 - Proposed : project1, I accept (because there is no project1 in the proposed folder)
 - Proposed : unit1, I put unit2 as .pas filename.
 - Here I have the new project, with an empty form.

- I decide to reload the prior project that I just saved above
 - Project / Recent project, the first one that comes.
 - Now I see unit2 that I specified above
 - Run F9 (it'll compile) maybe offering to debug ...
 - But project1.lpr(13,10) Error: Cannot find Unit1 used by project1 of the Project Inspector.
 - When I saved the form as unit2, it didn't correct the project1 replacing unit1 by unit2.
 
 If you dont get the same result as me, I go back to the programmer's asylum and drop the case. Thanks.

[wp]

- Run F9 (it'll compile) maybe offering to debug ...
 - But project1.lpr(13,10) Error: Cannot find Unit1 used by project1 of the Project Inspector.

What does this mean? "It'll compile" - but there is a compilation error message.

When I follow your listing of steps I do not have this error... But maybe there is still somethin which I am missing. I don't know, but is it important that there are two "project1" in your steps? I could imagine that the IDE gets confused in this situation

[BrunoK]

- When I saved the form as unit2, it (IDE) didn't correct the project1 replacing name of unit1 by unit2.
In the project1.lps and project1.lpi it refers to <Filename Value="unit2.pas"/> but it is not changed in the uses clause of the project1.lpr, it remains as unit1.

That's all.

[wp]

It doesn't do this for me: After saving the initial unit1 as unit2 I opened the project1.lpr and .lps files with Notepad++ outside the IDE and they clearly contain "unit2". But I have seen your case in many test projects, therefore I still believe that I am missing a tiny detail in your steps.

Ah, but here is a way I can reproduce your issue - by introducing an error which obviously is not detected before saving:

- Open the IDE
- In the uses clause remove the trailing semicolon after "unit unit1;"
- File > New > Application
- "Save changes to project1" - yes: Keep project1 as project name, save unit1 under a different name as unit2.
- Keep the IDE open, and open project1.lpr in an external editor (Notepad++) - now unit1 is listed!
- Open the previously saved project1 from the history list. Compile & run --> "cannot find unit1 used by project1"

[BrunoK]

Well, I would expect that since the saving of units is done under the IDE control, the IDE would adjust the reference in the project's .lpr file to reflect the selected name.

[BrunoK]

But frankly, knowing that the IDE behaves like that is not a problem ... ;-)