Only process selected lines in the Select Overlaps macro

And skip over commented lines as the description claimed it did already.

Closes #1751.

automation/autoload/select-overlaps.moon

@@ -19,13 +19,22 @@ export script_description = tr"Select lines which begin while another non-commen
 export script_author = "Thomas Goyne"
 export script_version = "2"
 
-select_overlaps = (subs) ->
-    -- filter subtitles lines to just dialogue lines and sort them by time
-    dialogue = {}
-    for i, line in ipairs subs
-        if line.class == "dialogue"
-            line.i = i
-            table.insert dialogue, line
+select_overlaps = (subs, selection) ->
+    is_dialogue = (line) ->
+        line.class == "dialogue" and not line.comment
+
+    -- Attach the original index to each line so that we know what to update in
+    -- the subs object after sorting by time
+    prepare = (i, line) ->
+        line.i = i
+        line
+
+    -- Filter subtitles lines to just dialogue lines and sort them by time
+    dialogue = if #selection <= 1
+        [prepare i, line for i, line in ipairs subs when is_dialogue line]
+    else
+        [prepare i, subs[i] for i in *selection when is_dialogue subs[i]]
+
     table.sort dialogue, (a,b) ->
         a.start_time < b.start_time or (a.start_time == b.start_time and a.i < b.i)
 
@@ -36,6 +45,7 @@ select_overlaps = (subs) ->
             end_time = line.end_time
         else
             table.insert overlaps, line.i
+
     overlaps
 
 aegisub.register_macro script_name, script_description, select_overlaps