MdTab: do not scroll editor when it is under the right header while entering edit mode

src/vmdtab.cpp

@@ -168,7 +168,7 @@ bool VMdTab::scrollWebViewToHeader(const VHeaderPointer &p_header)
     return true;
 }
 
-bool VMdTab::scrollEditorToHeader(const VHeaderPointer &p_header)
+bool VMdTab::scrollEditorToHeader(const VHeaderPointer &p_header, bool p_force)
 {
     if (!m_outline.isMatched(p_header)
         || m_outline.getType() != VTableOfContentType::BlockNumber) {
@@ -202,6 +202,17 @@ bool VMdTab::scrollEditorToHeader(const VHeaderPointer &p_header)
         }
     }
 
+    // If the cursor are now under the right title, we should not change it right at
+    // the title.
+    if (!p_force) {
+        int curBlockNumber = mdEdit->textCursor().block().blockNumber();
+        if (m_outline.indexOfItemByBlockNumber(curBlockNumber)
+            == m_outline.indexOfItemByBlockNumber(blockNumber)) {
+            m_currentHeader = p_header;
+            return true;
+        }
+    }
+
     if (mdEdit->scrollToHeader(blockNumber)) {
         m_currentHeader = p_header;
         return true;
@@ -253,7 +264,7 @@ void VMdTab::showFileEditMode()
         VUtils::sleepWait(100);
     }
 
-    scrollEditorToHeader(header);
+    scrollEditorToHeader(header, false);
 
     mdEdit->setFocus();
 }

src/vmdtab.h

@@ -185,7 +185,8 @@ private:
     // Return true if scroll was made.
     bool scrollWebViewToHeader(const VHeaderPointer &p_header);
 
-    bool scrollEditorToHeader(const VHeaderPointer &p_header);
+    // @p_force: when true, will scroll even current mouse is under the specified header.
+    bool scrollEditorToHeader(const VHeaderPointer &p_header, bool p_force = true);
 
     // Scroll web/editor to given header.
     // Return true if scroll was made.