get completion string based on trigger position instead of current word

src/TextInputWidget.cpp

@@ -129,10 +129,10 @@ void
 FilteredTextEdit::insertCompletion(QString completion)
 {
         // Paint the current word and replace it with 'completion'
-        auto cur_word = wordUnderCursor();
+        auto cur_text = textAfterPosition(trigger_pos_);
         auto tc       = textCursor();
-        tc.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor, cur_word.length());
-        tc.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor, cur_word.length());
+        tc.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor, cur_text.length());
+        tc.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor, cur_text.length());
         tc.insertText(completion);
         setTextCursor(tc);
 }
@@ -248,8 +248,8 @@ FilteredTextEdit::keyPressEvent(QKeyEvent *event)
         }
         case Qt::Key_Colon: {
                 QTextEdit::keyPressEvent(event);
+                trigger_pos_      = textCursor().position() - 1;
                 emoji_popup_open_ = true;
-                emoji_completion_model_->setFilterRegExp(wordUnderCursor());
                 break;
         }
         case Qt::Key_Return:
@@ -311,15 +311,15 @@ FilteredTextEdit::keyPressEvent(QKeyEvent *event)
                 if (isModifier)
                         return;
 
-                if (emoji_popup_open_ && wordUnderCursor().length() > 2) {
+                if (emoji_popup_open_ && textAfterPosition(trigger_pos_).length() > 2) {
                         // Update completion
-                        emoji_completion_model_->setFilterRegExp(wordUnderCursor());
+                        emoji_completion_model_->setFilterRegExp(textAfterPosition(trigger_pos_));
                         completer_->complete(completerRect());
                 }
 
                 if (emoji_popup_open_ &&
                     (completer_->completionCount() < 1 ||
-                     !wordUnderCursor().contains(QRegExp(":[^\r\n\t\f\v :]+$")))) {
+                     !textAfterPosition(trigger_pos_).contains(QRegExp(":[^\r\n\t\f\v :]+$")))) {
                         // No completions for this word or another word than the completer was
                         // started with
                         emoji_popup_open_ = false;
@@ -441,7 +441,8 @@ FilteredTextEdit::completerRect()
         // Move left edge to the beginning of the word
         auto cursor = textCursor();
         auto rect   = cursorRect();
-        cursor.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor, wordUnderCursor().length());
+        cursor.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor, 
+        		textAfterPosition(trigger_pos_).length());
         auto cursor_global_x  = viewport()->mapToGlobal(cursorRect(cursor).topLeft()).x();
         auto rect_global_left = viewport()->mapToGlobal(rect.bottomLeft()).x();
         auto dx               = qAbs(rect_global_left - cursor_global_x);

src/TextInputWidget.h

@@ -86,6 +86,7 @@ private:
         bool emoji_popup_open_ = false;
         CompletionModel *emoji_completion_model_;
         std::deque<QString> true_history_, working_history_;
+        int trigger_pos_; // Where emoji completer was triggered
         size_t history_index_;
         QCompleter *completer_;
         QTimer *typingTimer_;
@@ -116,7 +117,14 @@ private:
                 cursor.movePosition(QTextCursor::StartOfWord, QTextCursor::KeepAnchor);
                 return cursor.selectedText();
         }
-        QString wordUnderCursor()
+        QString textAfterPosition(int pos)
+        {
+                auto tc = textCursor();
+                tc.setPosition(pos);
+                tc.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
+                return tc.selectedText();
+        }
+        /*QString wordUnderCursor()
         {
                 auto tc          = textCursor();
                 auto editor_text = toPlainText();
@@ -130,7 +138,7 @@ private:
                 // Revert back
                 std::reverse(text.begin(), text.end());
                 return text;
-        }
+        }*/
 
         dialogs::PreviewUploadOverlay previewDialog_;