bug fix

1. InsertImageDialog crashes when file does not exist;
2. Use &nbsp; for leading spaces of <p> element in Turndown;

src/core/configmgr.cpp

@@ -24,7 +24,7 @@
 using namespace vnotex;
 
 #ifndef QT_NO_DEBUG
-//    #define VX_DEBUG_WEB
+    #define VX_DEBUG_WEB
 #endif
 
 const QString ConfigMgr::c_orgName = "VNote";

src/data/extra/web/js/turndown.js

@@ -21,10 +21,13 @@ class TurndownConverter {
 
         // TODO: verify and copy several rules from VNote 2.0.
         this.fixMark();
+
+        this.fixParagraph();
     }
 
     turndown(p_html) {
-        return this.ts.turndown(p_html);
+        let markdown = this.ts.turndown(p_html);
+        return markdown;
     }
 
     // Trim a string into 3 parts: leading spaces, content, trailing spaces.
@@ -69,6 +72,25 @@ class TurndownConverter {
         });
     }
 
+    fixParagraph() {
+        this.ts.addRule('paragraph', {
+            filter: 'p',
+            replacement: function(content) {
+                // Replace leading spaces with   to avoid being parsed as code block.
+                let lRe = /^\s+/;
+                let ret = lRe.exec(content);
+                if (ret) {
+                    let leadingSpaces = ret[0];
+                    if (leadingSpaces.length > 3) {
+                        content = ' '.repeat(leadingSpaces.length) + content.slice(leadingSpaces.length);
+                    }
+                }
+
+                return '\n\n' + content + '\n\n'
+            }
+        });
+    }
+
     fixImage() {
         this.ts.addRule('img_fix', {
             filter: 'img',

src/widgets/dialogs/imageinsertdialog.cpp

@@ -61,6 +61,8 @@ void ImageInsertDialog::setupUI(const QString &p_title,
     auto gridLayout = new QGridLayout();
     mainLayout->addLayout(gridLayout);
 
+    mainLayout->addStretch();
+
     // Image Path.
     m_imagePathEdit = WidgetsFactory::createLineEdit(p_imagePath, mainWidget);
     m_imagePathEdit->setReadOnly(!m_browserEnabled);
@@ -172,7 +174,13 @@ void ImageInsertDialog::checkImagePathInput()
     }
 
     if (url.isLocalFile()) {
-        setImage(FileUtils::imageFromFile(url.toLocalFile()));
+        const auto localFile = url.toLocalFile();
+        if (QFileInfo::exists(localFile)) {
+            setImage(FileUtils::imageFromFile(localFile));
+        } else {
+            setImage(QImage());
+        }
+
         m_source = Source::LocalFile;
     } else {
         setImage(QImage());

src/widgets/editors/markdowneditor.cpp

@@ -1049,7 +1049,7 @@ void MarkdownEditor::fetchImagesToLocalAndReplace(QString &p_text)
         }
 
         const QString imageTitle = purifyImageTitle(regExp.cap(1).trimmed());
-        const QString imageUrl = regExp.cap(2).trimmed();
+        QString imageUrl = regExp.cap(2).trimmed();
 
         const int maxUrlLength = 100;
         QString urlToDisplay(imageUrl);
@@ -1091,6 +1091,10 @@ void MarkdownEditor::fetchImagesToLocalAndReplace(QString &p_text)
             }
         } else {
             // Network path.
+            // Prepend the protocol if missing.
+            if (imageUrl.startsWith(QStringLiteral("//"))) {
+                imageUrl.prepend(QStringLiteral("https:"));
+            }
             QByteArray data = vte::Downloader::download(QUrl(imageUrl));
             if (!data.isEmpty()) {
                 auto suffix = info.suffix();