diff --git a/ios/engine/KMEI/KeymanEngine/resources/Keyman.bundle/Contents/Resources/ios-host.js b/ios/engine/KMEI/KeymanEngine/resources/Keyman.bundle/Contents/Resources/ios-host.js
index 621e643bb94..d5eb798b67d 100644
--- a/ios/engine/KMEI/KeymanEngine/resources/Keyman.bundle/Contents/Resources/ios-host.js
+++ b/ios/engine/KMEI/KeymanEngine/resources/Keyman.bundle/Contents/Resources/ios-host.js
@@ -287,9 +287,16 @@ function setKeymanContext(text, doSync, selStart, selLength) {
     let selEnd = selStart + selLength;
     selEnd = isNaN(selEnd) ? undefined : selEnd;
 
-    const shouldReset = keyman.context.updateContext(text, selStart, selEnd);
-    if(!doSync || shouldReset) {
+    if(doSync) {
+      const shouldReset = keyman.context.updateContext(text, selStart, selEnd);
+      if(shouldReset) {
         keyman.resetContext();
+      }
+    } else {
+      // if not in "sync" mode, we have a hard context reset; just full-reset it.
+      keyman.context.setText(text);
+      keyman.context.setSelection(selStart, selStart+selLength);
+      keyman.resetContext();
     }
 }
 
diff --git a/web/src/app/webview/src/contextManager.ts b/web/src/app/webview/src/contextManager.ts
index 2f6cfd6ae7a..d9ef2c6e52b 100644
--- a/web/src/app/webview/src/contextManager.ts
+++ b/web/src/app/webview/src/contextManager.ts
@@ -60,18 +60,24 @@ export class ContextHost extends Mock {
 
   updateContext(text: string, selStart: number, selEnd: number): boolean {
     let shouldResetContext = false;
-    if(text != this.text) {
-      let tempMock = new Mock(text, selStart ?? text._kmwLength(), selEnd ?? text._kmwLength());
-
-      let newLeft = tempMock.getTextBeforeCaret();
-      let oldLeft = this.getTextBeforeCaret();
+    let tempMock = new Mock(text, selStart ?? text._kmwLength(), selEnd ?? text._kmwLength());
+    let newLeft = tempMock.getTextBeforeCaret();
+    let oldLeft = this.getTextBeforeCaret();
 
+    if(text != this.text) {
       let unexpectedBeforeCharCount = findCommonSubstringEndIndex(newLeft, oldLeft, true) + 1;
       shouldResetContext = !!unexpectedBeforeCharCount;
     }
 
     if(shouldResetContext) {
       this.text = text;
+      this.selStart = selStart;
+      this.selEnd = selEnd;
+    } else {
+      // Transform selection coordinates to their location within the longform context window.
+      let delta = oldLeft._kmwLength() - newLeft._kmwLength();
+      this.selStart = selStart - delta;
+      this.selEnd = selEnd - delta;
     }
 
     if(selStart === undefined || selEnd === undefined) {