Findadv: Handle \lettrine{} in initials.module

The problem here is, that selecting any subset of a \lettrine{}
line always creates an initials header. That makes it impossible
to our search engine to find strings, because the regex does not
contain that info. So we have to discard the leading \lettrine part
completely.
We place now a marker (\endarguments) to determine that removable
part.

src/lyxfind.cpp

@@ -1037,7 +1037,10 @@ class KeyInfo {
     /* item */
     isList,
     /* tex, latex, ... like isChar */
-    isIgnored
+    isIgnored,
+    /* like \lettrine[lines=5]{}{} */
+    cleanToStart,
+    endArguments
   };
  KeyInfo()
    : keytype(invalid),
@@ -1755,7 +1758,8 @@ void LatexInfo::buildKeys(bool isPatternString)
   makeKey("par|uldepth|ULdepth|protect|nobreakdash", KeyInfo(KeyInfo::isStandard, 0, true), isPatternString);
   // Remove RTL/LTR marker
   makeKey("l|r|textlr|textfr|textar|beginl|endl", KeyInfo(KeyInfo::isStandard, 0, true), isPatternString);
-
+  makeKey("lettrine", KeyInfo(KeyInfo::cleanToStart, 0, true), isPatternString);
+  makeKey("endarguments", KeyInfo(KeyInfo::endArguments, 0, true), isPatternString);
   if (isPatternString) {
     // Allow the first searched string to rebuild the keys too
     keysBuilt = false;
@@ -1891,6 +1895,35 @@ int LatexInfo::dispatch(ostringstream &os, int previousStart, KeyInfo &actual)
   int nextKeyIdx = 0;
   switch (actual.keytype)
   {
+    case KeyInfo::cleanToStart: {
+      actual._dataEnd = actual._dataStart;
+      if (interval.par[actual._dataStart] == '[') {
+        // Discard optional params
+        actual._dataStart = interval.findclosing(actual._dataStart+1, interval.par.length(), '[', ']') + 1;
+      }
+      actual._dataEnd = actual._dataStart;
+      nextKeyIdx = getNextKey();
+      // Search for end of arguments
+      int tmpIdx = nextKeyIdx;
+      while (tmpIdx > 0) {
+        KeyInfo &nextk = entries[tmpIdx];
+        if (nextk.keytype == KeyInfo::endArguments) {
+          actual._dataEnd = nextk._dataEnd;
+          break;
+        }
+        nextk.disabled = true;
+        tmpIdx++;
+        if (tmpIdx >= int(entries.size()))
+          break;
+      }
+      while (interval.par[actual._dataEnd] == ' ')
+        actual._dataEnd++;
+      interval.addIntervall(0, actual._dataEnd+1);
+      interval.actualdeptindex = 0;
+      interval.depts[0] = actual._dataEnd+1;
+      interval.closes[0] = -1;
+      break;
+    }
     case KeyInfo::noContent: {          /* char like "\hspace{2cm}" */
       interval.addIntervall(actual._dataStart, actual._dataEnd);
     }
@@ -1929,6 +1962,11 @@ int LatexInfo::dispatch(ostringstream &os, int previousStart, KeyInfo &actual)
       }
       break;
     }
+    case KeyInfo::endArguments:
+      removeHead(actual);
+      processRegion(actual._dataStart, actual._dataStart+1);
+      nextKeyIdx = getNextKey();
+      break;
     case KeyInfo::noMain:
       // fall through
     case KeyInfo::isStandard: {

src/output_latex.cpp

@@ -530,6 +530,10 @@ void getArgInsets(otexstream & os, OutputParams const & runparams, Layout::LaTeX
 			}
 		}
 	}
+	if (runparams.for_search) {
+		// Mark end of arguments for findadv() only
+		os << "\\endarguments{}";
+	}
 }