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Now it shows immediately when there is only a single signature of a
given method/constructor.

setting

initialization

not compile

RevBy:    - dt

RevBy:    - dt

Especially when several error markers exist, the flashing this causes
while editing isn't really nice.

Reviewed-by: Roberto Raggi

(cherry picked from commit 9539bb2b)

   implement ^ and 0

Conflicts:
	src/plugins/debugger/procinterrupt.cpp

Conflicts:
	src/plugins/debugger/gdbengine.cpp