In MonoDevelop (linux version), ctrl+backspace clears all the linebreaks till the last word/char block, and delete that.
For example:
qwe asd
.
.
.
_
(where _ is my cursor focus is on, and . are line breaks, pressing ctrl+backspace will return me this:
qwe _
instead of:
qwe asd
.
.
_
How do I get rid of it?
Because MonoDevelop is freeware opensource project you can:
Report a bug (see this link for details) and wait for development team respose.
Try to locate wrong code on you own and contribute patch. See how on same page ...
The work breaking logic is configurable.
In Preferences->Text Editor->Behavior, change the work break mode. You probably want the SharpDevelop mode.
As ThinkJet said, because MD is a OSS project you can of course write a new word break mode if none of the existing ones fits your needs.