ghost: fix completion overlapping existing document text

- Don't show inline ghost note when cursor is mid-line (text exists
  after cursor) — the ghost would visually conflict with real content
- Only show multi-line overlay when cursor is near EOF, so continuation
  lines don't paint on top of existing document lines
- Tab-accept still works regardless of visual display

kate/ollie_ghost.cpp

@@ -144,12 +144,13 @@ QVector<int> OllieGhostProvider::inlineNotes(int line) const
     if (m_suggestionLines[0].isEmpty())
         return {};
 
+    // Don't show ghost text if cursor was mid-line — the suggestion would
+    // visually overlap or conflict with existing text after the cursor.
     int lineLen = m_view->document()->lineLength(line);
-    int col = m_suggestionStartCol;
-    if (col < lineLen)
-        col = lineLen;
+    if (m_suggestionStartCol < lineLen)
+        return {};
 
-    return {col};
+    return {lineLen};
 }
 
 QSize OllieGhostProvider::inlineNoteSize(const KTextEditor::InlineNote &note) const
@@ -367,9 +368,18 @@ void OllieGhostProvider::onCompletionReply(const QString &result)
     // Notify Kate to repaint the first line (inline note)
     emit inlineNotesChanged(m_suggestionStartLine);
 
-    // Show overlay for continuation lines (if multi-line)
+    // Show overlay for continuation lines only if they won't overlap
+    // existing document content (i.e. cursor is at or near EOF).
     if (m_suggestionLines.size() > 1) {
-        showOverlay();
+        auto *doc = m_view->document();
+        int linesBelow = doc->lines() - 1 - m_suggestionStartLine;
+        int continuationLines = m_suggestionLines.size() - 1;
+
+        // Only show overlay if there's enough empty space below
+        // (cursor line is within continuationLines of EOF)
+        if (linesBelow <= continuationLines) {
+            showOverlay();
+        }
     }
 }
 
@@ -439,7 +449,12 @@ void OllieGhostProvider::showSuggestionFromHistory()
 
     emit inlineNotesChanged(m_suggestionStartLine);
     if (m_suggestionLines.size() > 1) {
-        showOverlay();
+        auto *doc = m_view->document();
+        int linesBelow = doc->lines() - 1 - m_suggestionStartLine;
+        int continuationLines = m_suggestionLines.size() - 1;
+        if (linesBelow <= continuationLines) {
+            showOverlay();
+        }
     }
 }