[SourceEditor2] Don't allow Gtk.Entry.Text to be set to null
[Debugger] Drop unnecessary else's
[Debugger] Got rid of more ridiculous else's
[Debugger] If ToString() times out, fall back to default behavior

Fixes bug #11302
[Debugger] Get rid of unnecessary namespacing
[TextEditor] Don't hide tooltip windows if they are the active window

On Windows, debugger tooltip windows gain focus because they are
user-interactive which causes the TextArea to lose focus, and
when that happens, the old logic would hide the tooltip.

Don't do that.

Should fix bug #11155
[Debugger] Make SoftDebuggerSession.Dispose() safe to call multiple times
[Debugger] Another attempt at fixing debugger tooltips on Windows

Hopefully this fixes bug #11155
Fixed 'Bug 11303 - opt-/ enters "oslash" instead of ÷'.
[TextEditor] Fixed quick diff colors in tango scheme
[TextEditor] Segment markers can now handle input actions & fixed a
selection drag bug.
[Refactoring] Implemented nicer smart tag system.
Updated nrefactory.
[TextEditor] Text markers can now suppress tooltip popup.
[TextEditor] Implemented a more general way to control the tooltip
behavior.
[Refactoring] Smart tags now get reused (saves a bunch of screen
redraws).
Updated nrefactory.
[Refactoring] Code analysis actions now have their region attached to
as well.
[TextEditor] Fixed some message bubble colors.
[Refactoring] Lowered the smart tag marker a bit.