Some questions about GPS

[Ian Douglas <ian@vionia.com>]

Hi

Please advise if off topic.

Finally trying to learn Ada, after years of PHP. Did Pascal at varsity back in the 80s.

Using GPS on Linux but some things driving me nuts, so need to determine if "that's the way it is" or is my configuration is flaky. 

1. Line numbers: selected option for "all" but only first few are shown, then they stop. 

2. When selecting text to copy/cut, it reverts to black on white when selected. I'm used to Kate where selected text gets a different background so you can clearly see what you've selected. Is this me or the way the editor works (and IMHO this is sub-optimal for usability).

3. Am trying to read in a file, play with it, and write it out. So started with "Expanded with proper error handling and reporting it reads:" example (2nd one) on https://www.rosettacode.org/wiki/File_input/output#Line_by_line , but the compiler insists that the two "close input" statements are "unreachable code".
Is this normal? If I comment them out, it compiles okay. And runs okay.

Thanks, Ian