searching for Jongware merge text boxes script

I had to do a fair amount of searching myself, as I have no need of this function and so did not save it somewhere on any of my computers - but was this the one you are looking for? http://indesignsecrets.com/topic/is-there-a-script-to-combine-selected-frames-as-threaded-text-40

Note the reference to the same Textstich at the very end of that discussion.

I know of one that was created by Ajar Productions: Ajar Productions » Merge TextFrames Extension for Adobe InDesign

Hello, margoo!

Select the frames you want to thread one by one holding the SHIFT key and run this code snippet:

for( var n=0; n<app.selection.length-1; n++ )
{
	app.selection[n].nextTextFrame = 
	app.selection[n+1]
};

Is that fast enough?
Some clicks and perhaps a KBSC for running the snippet?
(ExtendScript/JavaScript)

How to save ExtendScript code to a script file and to install it so that you can use it in the Scripts panel of InDesign:

[1] Copy the code above to an unformatted text file.

[2] Save it to your desktop with the suffix *.jsx with a name like:

threadSelectedTextFramesInOrderOfSelection.jsx

[3] Back to InDesign: Open the Scripts panel in InDesign

[4] Select the User folder in the Scripts panel and use the command from the Scripts panel to show the folder in the Finder (MacOS) or Explorer (Windows)

You see now that a folder named Scripts Panel is selected in your file system.

Copy the script file you created in step [2] to the Scripts Panel folder.

That's the installation process. Just move or copy a script file to a special folder.

[5] Go back to InDesign.

The script should be listed in the User folder of your Scripts panel in InDesign.

To execute the script either do a double-click on the name of that listed script or use the command from the Scripts panel fly out menu after you selected the name of the script that is listed.

Regards,
Uwe Laubender
( Adobe Community Professional )

EDITED AND ADDED STEPS TO SAVE CODE TO A SCRIPT FILE AND INSTALL IT.