fixed crash with autosearch caused by starting several simultaneous queries

src/qtgui/main.cpp

@@ -108,6 +108,7 @@ void startManual(const string& helpindex)
 
 bool maybeOpenDb(string &reason, bool force, bool *maindberror)
 {
+    LOGDEB2(("maybeOpenDb: force %d\n", force));
     if (!rcldb) {
 	reason = "Internal error: db not created";
 	return false;

src/qtgui/rclmain_w.cpp

@@ -769,7 +769,13 @@ void RclMain::rebuildIndex()
 // Start a db query and set the reslist docsource
 void RclMain::startSearch(RefCntr<Rcl::SearchData> sdata)
 {
-    LOGDEB(("RclMain::startSearch. Indexing %s\n", m_idxproc?"on":"off"));
+    LOGDEB(("RclMain::startSearch. Indexing %s Active %d\n", 
+	    m_idxproc?"on":"off", m_queryActive));
+    if (m_queryActive) {
+	LOGDEB(("startSearch: already active\n"));
+	return;
+    }
+    m_queryActive = true;
     m_source = RefCntr<DocSequence>();
 
     // The db may have been closed at the end of indexing
@@ -777,6 +783,7 @@ void RclMain::startSearch(RefCntr<Rcl::SearchData> sdata)
     // If indexing is being performed, we reopen the db at each query.
     if (!maybeOpenDb(reason, m_idxproc != 0)) {
 	QMessageBox::critical(0, "Recoll", QString(reason.c_str()));
+	m_queryActive = false;
 	return;
     }
 
@@ -818,9 +825,8 @@ class QueryThread : public QThread {
 
 void RclMain::initiateQuery()
 {
-    if (m_queryActive || m_source.isNull())
+    if (m_source.isNull())
 	return;
-    m_queryActive = true;
 
     QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
     QueryThread qthr(m_source);

src/qtgui/ssearch_w.cpp

@@ -36,6 +36,10 @@
 #include "wasatorcl.h"
 #include "rclhelp.h"
 
+// Typing interval after which we consider starting autosearch: no sense to do
+// this is user is typing fast and continuously
+static const int strokeTimeoutMS = 250;
+
 void SSearch::init()
 {
     // See enum above and keep in order !
@@ -103,12 +107,13 @@ void SSearch::searchTextChanged(const QString& text)
 	if (prefs.ssearchAsYouType && !m_disableAutosearch && 
 	    !m_keystroke && m_tstartqs == qs) {
 	    m_disableAutosearch = true;
-	    LOGDEB0(("SSearch::searchTextChanged: autosearch\n"));
 	    string s;
 	    int cs = partialWord(s);
+	    LOGDEB0(("SSearch::searchTextChanged: autosearch. cs %d s [%s]\n", 
+		     cs, s.c_str()));
 	    if (cs < 0) {
 		startSimpleSearch();
-	    } else if (!m_stroketimeout->isActive()) {
+	    } else if (!m_stroketimeout->isActive() && s.size() >= 2) {
 		s = qs2utf8s(queryText->currentText());
 		s += "*";
 		startSimpleSearch(s, 20);
@@ -328,6 +333,8 @@ void SSearch::setAnyTermMode()
     searchTypCMB->setCurrentIndex(SST_ANY);
 }
 
+// If text does not end with space, return last (partial) word and >0
+// else return -1
 int SSearch::partialWord(string& s)
 {
     // Extract last word in text
@@ -648,7 +655,7 @@ bool SSearch::eventFilter(QObject *target, QEvent *event)
 		QString qs = queryText->currentText();
 		LOGDEB0(("SSearch::eventFilter: start timer, qs [%s]\n", 
 			 qs2utf8s(qs).c_str()));
-		m_stroketimeout->start(200);
+		m_stroketimeout->start(strokeTimeoutMS);
 	    }
 	}
     }