[Eric] [eric5.0] a few bugs, possibly

[Angus]

Thanks Detlev, for the quick response earlier. I've used Eric (eric5)
for half a day now and I must say I'm impressed with all the features.
Great work. Hope you don't mind going over a few minor things I came
across though. All for the sake of perfect polish, I guess.

*) The values I set in:
Settings > Preferences > Editor > General > Tab width
Settings > Preferences > Editor > Edge Mode > Column Number
Are devided by 2 in the applied output (e.g. setting a tab width of 4
creates an actual tab width of 2 in the editor).
I'm using the standard Python3 encoding (without declaration): utf-8.

*) Py3Flakes doesn't understand the 'with' statement even though
that's recommended way of handling files according to the official
Python tutorial:
>>>with open('foo', 'r') as f:
>>>    l = f.readlines()
causes: "py3flakes warning: Undefined name 'f'."

*) This one is a bit hard to describe, but the only one giving me
grief. It happens in various widgets containing text, but I'll just
try to give one specific example of the treeview in Settings >
Preferences:
Click the triangle next to an item (e.g. "Debugger"). Often there will
be no response. Nor will the second click. But then, moving the
mousing pointer down will cause the screen to update that area. That
is, the positioning of text will change "on the fly", which looks like
the screen is "tearing" wherever you move the mouse pointer to. This
also regularly happens in the help viewer when reading documentation,
but I've trouble reproducing it consistently (some combination of
scrolling, selecting text and/or moving the mouse pointer).

*) Finally, I consider it a bug to have no public bug tracker (or if
there is one, it's too hard to find). Having one would it make it
easier for the developer to keep track of open issues. Furthermore, it
would make it a lot easier for users to find out what issues are
already known to the developer, saving wasted energy on redundant
reports by users and replies by the developer.

Cheers,
Ang.