fix(lyrics): restore adaptive lyrics layout

lyrics/lyric_sources.py

@@ -81,6 +81,8 @@ def finalize(lines, total_duration=0):
             item.get("romanization", item.get("romanized", item.get("romaji", ""))),
             item.get("chars", item.get("charTimes", [])),
         )
+        if item.get("duration_inferred") is True:
+            normalized["duration_inferred"] = True
         if normalized["text"] or normalized["translation"] or normalized["romanization"]:
             cleaned.append(normalized)
     cleaned.sort(key=lambda item: (item["time"] < 0, item["time"] if item["time"] >= 0 else 0))
@@ -93,6 +95,7 @@ def finalize(lines, total_duration=0):
         )
         if next_time:
             item["duration"] = max(0, next_time - item["time"])
+            item["duration_inferred"] = True
     return cleaned
 
 

lyrics/lyrics.luau

@@ -166,7 +166,7 @@ local function getLineInfo()
     or (startTime + 4000)
   local lineEnd = nextTime
 
-  if line.duration and line.duration > 0 then
+  if line.duration and line.duration > 0 and line.duration_inferred ~= true then
     lineEnd = math.min(nextTime, startTime + line.duration)
   elseif nextTime - startTime >= INTERLUDE_GAP_MS then
     -- LRC only marks line starts. Do not stretch a lyric across a long instrumental gap.
@@ -294,8 +294,9 @@ local function secondaryText(line)
   return translation ~= "" and translation or romanization
 end
 
-local function secondaryRowEnabled()
+local function secondaryRowEnabled(text)
   return doubleLine and (showTranslation or showRomanization)
+    and type(text) == "string" and text:match("%S") ~= nil
 end
 
 local function compactMetrics(hasSecondary, vertical)
@@ -457,8 +458,8 @@ local function render()
     if info then
       local shownLine, opacity = currentTransitionLine(info)
       if shownLine then
-        local showSecondaryRow = secondaryRowEnabled() and not shownLine.cue and not info.cue
-        local secondary = showSecondaryRow and secondaryText(shownLine) or ""
+        local secondary = secondaryText(shownLine)
+        local showSecondaryRow = secondaryRowEnabled(secondary) and not shownLine.cue and not info.cue
         local fontScale, effectiveLineGap = compactMetrics(showSecondaryRow, vertical)
         lineNodes[#lineNodes + 1] = buildLineRow(shownLine, {
           key = "current-" .. tostring(info.index),