Use 'key in dict' instead of 'key in dict.keys()'

[MartinThoma]

No description provided.

[ferdnyc]

👍 Drives me nuts.

I had some suggestions, if we're going to be fixing things anyway...

(Unfortunately, because they cross deleted lines in the diff, I couldn't leave them as actual suggestions that could be applied directly from the review interface.)

[ferdnyc]

And here (which extended too far outside the diff to review-comment on at all)...

openshot-qt/src/windows/views/files_treeview.py

Lines 186 to 195 in c79d13f

	if name and name != os.path.basename(f.data["path"]):
	f.data["name"] = name
	else:
	f.data["name"] = os.path.basename(f.data["path"])
	if "tags" in f.data:
	if tags != f.data["tags"]:
	f.data["tags"] = tags
	elif tags:
	f.data["tags"] = tags

that can all be just:

f.data.update({"name": name or os.path.basename(f.data.get("path"))})
if "tags" in f.data or tags:
    f.data.update({"tags": tags})

No real point in those inequality tests, when any inequality results in an assignment. The lookup to get the current value may be slightly cheaper than the assignment, but it's also completely redundant whenever we have to do the assignment. Might as well skip the test and just always assign. If it happens to be the same value it already held, what's the harm?

[ferdnyc]

LGTM! One minor typo to fix, and then I'm good to merge. Thanks!