fix break line check algorithm

If specify the break line on the method definition, it stops at
the beggining of method at called time (don't stop at method
definition timing).

The line check algorithm has a bug and this patch fix it.

lib/debug/breakpoint.rb

@@ -273,13 +273,10 @@ def try_activate root_iseq = nil
 
           if !nearest || ((line - nline).abs < (line - nearest.line).abs)
             nearest = NearestISeq.new(iseq, nline, events)
-          else
-            if @hook_call && nearest.iseq.first_lineno <= iseq.first_lineno
-              if (nearest.line > line && !nearest.events.include?(:RUBY_EVENT_CALL)) ||
-                (events.include?(:RUBY_EVENT_CALL))
-                nearest = NearestISeq.new(iseq, nline, events)
-              end
-            end
+          elsif @hook_call &&
+                nearest.line == iseq.first_line &&
+                events.include?(:RUBY_EVENT_CALL)
+            nearest = NearestISeq.new(iseq, nline, events)
           end
         end
       end

test/console/break_test.rb

@@ -838,4 +838,89 @@ def test_break_on_realoded_file
       end
     end
   end
+
+  class BreakAtLineTest < ConsoleTestCase
+    def program path
+      <<~RUBY
+      1| load #{path.dump}
+      RUBY
+    end
+
+    def extra_file
+      <<~RUBY
+      a = 1
+
+      class C
+        def m
+          p :m
+        end
+      end
+      RUBY
+    end
+
+    def test_break_on_line
+      with_extra_tempfile do |extra_file|
+        debug_code program(extra_file.path) do
+          type "break #{extra_file.path}:1"
+          type 'c'
+          assert_line_num 1
+          type 'c'
+        end
+      end
+    end
+
+    def program2
+      <<~RUBY
+      1| a = 1
+      2| b = 2      # braek 2, stop at 2
+      3|            # break 3, stop at def
+      4| def foo    # break 4, stop at 5 (in foo)
+      5|   a = 2
+      6| end
+      7|
+      8| private def bar # break 8, stop at 9 (in bar)
+      9|   a = 3
+     10| end
+     11|
+     12| foo
+     13| bar
+      RUBY
+    end
+
+    def test_break_on_line_2
+      debug_code program2 do
+        type 'b 2'
+        type 'c'
+        assert_line_num 2
+        type 'c'
+      end
+    end
+
+    def test_break_on_line_3
+      debug_code program2 do
+        type 'b 3'
+        type 'c'
+        assert_line_num 4
+        type 'c'
+      end
+    end
+
+    def test_break_on_line_4
+      debug_code program2 do
+        type 'b 4'
+        type 'c'
+        assert_line_num 5
+        type 'c'
+      end
+    end
+
+    def test_break_on_line_8
+      debug_code program2 do
+        type 'b 8'
+        type 'c'
+        assert_line_num 9
+        type 'c'
+      end
+    end
+  end
 end