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LESS CSS nesting classes

I'm using LESS to improve my CSS and am trying to nest a class within a class. There's a fairly complicated hierarchy but for some reason my nesting doesn't work. I have this: ...
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GCD to perform task in main thread

I have a callback which might come from any thread. When I get this callback, then I would like to perform a certain task on the main thread. ...
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What's the equivalent for eclipse's ALT+UP/DOWN (move line) in Visual Studio?

In Eclipse, selecting a line and pressing Alt + ↑ / ↓ will move the line up and down, a quick way to avoid copy&paste. Is there an equivalent in Visual Studio? ...
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What are the differences between -std=c++11 and -std=gnu++11?

What are the differences between -std=c++11 and -std=gnu++11 as compilation parameter for gcc and clang? Same question with c99 and gnu99 ? I know about C++ and C standards, it's the differences in the parameters that interest me. ...
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Python: most idiomatic way to convert None to empty string?

What is the most idiomatic way to do the following? 16 Answers 16 ...
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Android: What's the difference between Activity.runOnUiThread and View.post?

What's the difference between Activity.runOnUiThread and View.post , could someone, please, explain? 4 Answers ...
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Class constants in python

In python, I want a class to have some "constants" (practically, variables) which will be common in all subclasses. Is there a way to do it with friendly syntax? Right now I use: ...
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Difference between filter and filter_by in SQLAlchemy

Could anyone explain the difference between filter and filter_by functions in SQLAlchemy? Which one should I be using? ...
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Show control hierarchy in the WinForms designer

One of our clients has an old WinForms application that contains forms with a lot of controls on them. Some of those controls have a deep hierarchy and that makes it to hard to select them in the designer. ...
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Instance variables vs. class variables in Python

I have Python classes, of which I need only one instance at runtime, so it would be sufficient to have the attributes only once per class and not per instance. If there would be more than one instance (which won't happen), all instance should have the same configuration. I wonder which of the follow...