diff --git a/src/components/views/rooms/BasicMessageComposer.js b/src/components/views/rooms/BasicMessageComposer.js
index c5661e561c..2764a8da46 100644
--- a/src/components/views/rooms/BasicMessageComposer.js
+++ b/src/components/views/rooms/BasicMessageComposer.js
@@ -116,6 +116,9 @@ export default class BasicMessageEditor extends React.Component {
             } catch (err) {
                 console.error(err);
             }
+            // if caret is a range, take the end position
+            const position = caret.end || caret;
+            this._setLastCaretFromPosition(position);
         }
         if (this.props.placeholder) {
             const {isEmpty} = this.props.model;
@@ -165,7 +168,6 @@ export default class BasicMessageEditor extends React.Component {
         this._modifiedFlag = true;
         const sel = document.getSelection();
         const {caret, text} = getCaretOffsetAndText(this._editorRef, sel);
-        this._setLastCaret(caret, text, sel);
         this.props.model.update(text, event.inputType, caret);
     }
 
@@ -183,10 +185,11 @@ export default class BasicMessageEditor extends React.Component {
     // we don't need to. But if the user is navigating the caret without input
     // we need to recalculate it, to be able to know where to insert content after
     // losing focus
-    _setLastCaret(caret, text, selection) {
-        this._lastSelection = cloneSelection(selection);
-        this._lastCaret = caret;
-        this._lastTextLength = text.length;
+    _setLastCaretFromPosition(position) {
+        const {model} = this.props;
+        this._isCaretAtEnd = position.isAtEnd(model);
+        this._lastCaret = position.asOffset(model);
+        this._lastSelection = cloneSelection(document.getSelection());
     }
 
     _refreshLastCaretIfNeeded() {
@@ -201,7 +204,7 @@ export default class BasicMessageEditor extends React.Component {
             this._lastSelection = cloneSelection(selection);
             const {caret, text} = getCaretOffsetAndText(this._editorRef, selection);
             this._lastCaret = caret;
-            this._lastTextLength = text.length;
+            this._isCaretAtEnd = caret.offset === text.length;
         }
         return this._lastCaret;
     }
@@ -223,7 +226,7 @@ export default class BasicMessageEditor extends React.Component {
     }
 
     isCaretAtEnd() {
-        return this.getCaret().offset === this._lastTextLength;
+        return this._isCaretAtEnd;
     }
 
     _onBlur = () => {
diff --git a/src/editor/position.js b/src/editor/position.js
index 98b158e547..4693f62999 100644
--- a/src/editor/position.js
+++ b/src/editor/position.js
@@ -120,4 +120,17 @@ export default class DocumentPosition {
         const atEnd = offset >= lastPart.text.length;
         return new DocumentOffset(offset, atEnd);
     }
+
+    isAtEnd(model) {
+        if (model.parts.length === 0) {
+            return true;
+        }
+        const lastPartIdx = model.parts.length - 1;
+        const lastPart = model.parts[lastPartIdx];
+        return this.index === lastPartIdx && this.offset === lastPart.text.length;
+    }
+
+    isAtStart() {
+        return this.index === 0 && this.offset === 0;
+    }
 }