Inconsistent warning re Arduino_GFX_Library

Development Tools IDE 1.x
1

I was isolating an unrelated issue in my usual IDE 2.3.6 and opened 1.8.19 to see if it helped me. Whatever sketch was loaded I saw this warning message, which had not been present at any stage in 2.3.6.

Invalid library found in C:\Users\terry\Dropbox\Electronics\Arduino\SKETCHES\libraries\Arduino_GFX_Library: no headers files (.h) found in C:\Users\terry\Dropbox\Electronics\Arduino\SKETCHES\libraries\Arduino_GFX_Library

Yet that's obviously incorrect because the library is present in my \libraries folder, including its header files. Is it because the name shown in its library.properties file is
name=Adafruit GFX Library
which contains spaces? If so does that imply 2.3.6 tolerates that inconsistency but 1.8.19 does not?

2

No. That has nothing to do with it. Spaces in library names are fully supported by both versions of Arduino IDE. This is a "red herring".

As the text indicates, this warning is shown if a folder is found under the libraries subfolder of your sketchbook that does not contain a header file.

3

I don't follow? The folder contains the several .h files as I said.

Also, I was about to report that my guess seemed correct, as after editing the library.properties file and re-opening 1.8.19 the warning did not re-occur.