I discovered a strange IDE issue concerning the tooltips in Lazarus when using TIdFTP objects from Indy10.
I have made two installations of Lazarus 1.8.4 + FPC 3.0.4, one on Windows7 and one in IUbuntu 18.04.
I am working on a project ported from Delphi 2007 which uses Indy10. So in both IDE:s I have used the IndyLaz package (installed it via OnLine PackageManager).

In both environments the project builds OK, no errors or warnings, but in the Lazarus IDE there are differences:

Windows version:
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If I type the name of a TIdFTP variable and wait a few seconds to get it highlighted, then type the period, the tooltips pop up with the possible methods I can use. This is expected and useful.

Ubuntu Linux x64 version:
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If I do the same in this environment nothing pops up, instead there is an error message in the messages panel:

Codetools, Errors: 1
IdGlobal.pas(1889,105) Error: expected ;, but deprecated found

So I opened the iundicated line by clicking on the error message and got to this:

{$IFDEF UNIX}
  GOffsetFromUTC: TDateTime = 0{$IFDEF HAS_DEPRECATED}{$IFDEF
USE_SEMICOLON_BEFORE_DEPRECATED};{$ENDIF} deprecated{$ENDIF};
{$ENDIF}

Apparently this line, which does not even exist on Windows breaks the tooltips in Lazarus without breaking the compiler 3.0.4.

I have now tested a number of variations of this line without success:

GOffsetFromUTC: TDateTime = 0 deprecated;
==> IdGlobal.pas(1890,33) Error: expected ;, but deprecated found
GOffsetFromUTC: TDateTime = 0; deprecated;
==> IdGlobal.pas(1896,3) Error: expected end., but IndyPos found

except:

GOffsetFromUTC: TDateTime = 0;
==> This actually works in the IDE to bring up the IdFTP methods tooltips!

And the project builds without any errors or warnings related to this, just warns about variables that are not used in my own code. They should be ifdef:ed for DELPHI...

I asked Remy Lebeau about this and he suggested I report this on the Lazarus list since he has had debates before on this very issue... Why is there a construct like that in the IdGlobals file in the first place???

Lazarus without tool-tips for complex classes like this is no good.

If a syntax is accepted by FPC then it should be accepted also by CodeTools. Please open a bug report with a minimal example code. Do not include units from Indy. Just reduce the problematic line into its simplest form that triggers the bug.

Juha

BTW, what you call a tooltip is actually an identifier completion window. A tooltip is just a hint window for a ToolButton or similar.

Juha