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Thanks I have implemented and test the lexer and editor in the way you suggested and made several tests and I have not been able to trigger any error so far.

However, it would have been nice if I could just temporarily disable the timer while changing text.

I use linux mint 19, Lazarus 2.1.0 and FPC 3.04. If you do not have the error then it must be related to FPC on linux mint. I just click once in the listbox and then use arrow keys to go up and down and the error occurs relatively fast (within a few seconds). You can see the video below: https://dri...

Thanks a lot for your comments. I followed your suggestions and changed the two functions to the below code. However, I still get the procedure TFPSList.CheckIndex(AIndex : Integer);" triggered after a few clicks if I have one file above 3000 lines. procedure TForm1.ListBox1Click(Sender: TObjec...

The program can be downloaded from below link:

https://drive.google.com/open?id=1rX-Y7 ... fpn6lRk9T4

Thanks,

Rune

Sorry for taking a long time to reply. I had to make a simple example that reproduce the error which toke me some time since I was not sure what caused the error. I am now rather confident that the problem is related to the lexers. I made the below program using the components from CudaText. Note it...

TFPSList.CheckIndex(AIndex : Integer); ATSynEdit_fgl threw an error I am not able back track it. I searched for the problem and there was an indexed web page on this problem but the web page have been deleted. From the Google search it suggested that this error can have something to do with undo red...

I ended up using method to using the add marks function because I do not fully master the lexer syntax.

Thanks,

Rune

I am not sure if "highlighting (e.g. by bold or underline) start and end bracket/quote/parenthesis" is an option for the ATsynedit or if it can be specified in a lexer and how to do it. I did not see it implemented in any of the demos for ATsynedit nor in CudaText. I find this feature very...

I am not sure if it is good idea but it would be nice if one could just specify a lexer directory for ATSynEdit and then the lexers auto load. However, now where I know how it works it is not a big deal to use the component as it is.

Thanks,

Rune

Excellent, I got it working but I needed to import some units from CudaText that I guess ideally should be part of the components.

Thanks also for making ATsynedit available and for fixing demo_econtrol_lexer_lib.

best,

Rune