Bug 961703 Commit or cancel composition when text/selection/focus is changed during composition for avoiding making some TIPs confused r=m_kato

widget/windows/nsTextStore.cpp

@@ -678,7 +678,15 @@ bool
 nsTextStore::Destroy(void)
 {
   PR_LOG(sTextStoreLog, PR_LOG_ALWAYS,
-    ("TSF: 0x%p nsTextStore::Destroy()", this));
+    ("TSF: 0x%p nsTextStore::Destroy(), mComposition.IsComposing()=%s",
+     this, GetBoolName(mComposition.IsComposing())));
+
+  // If there is composition, TSF keeps the composition even after the text
+  // store destroyed.  So, we should clear the composition here.
+  if (mComposition.IsComposing()) {
+    NS_WARNING("Composition is still alive at destroying the text store");
+    CommitCompositionInternal(false);
+  }
 
   mContent.Clear();
   mSelection.MarkDirty();
@@ -3065,18 +3073,22 @@ nsTextStore::OnTextChangeInternal(uint32_t aStart,
 {
   PR_LOG(sTextStoreLog, PR_LOG_DEBUG,
          ("TSF: 0x%p nsTextStore::OnTextChangeInternal(aStart=%lu, "
-          "aOldEnd=%lu, aNewEnd=%lu), mSink=0x%p, mSinkMask=%s",
+          "aOldEnd=%lu, aNewEnd=%lu), mSink=0x%p, mSinkMask=%s, "
+          "mComposition.IsComposing()=%s",
           this, aStart, aOldEnd, aNewEnd, mSink.get(),
-          GetSinkMaskNameStr(mSinkMask).get()));
+          GetSinkMaskNameStr(mSinkMask).get(),
+          GetBoolName(mComposition.IsComposing())));
 
   if (IsReadLocked()) {
     return NS_OK;
   }
 
-  NS_ASSERTION(!mComposition.IsComposing(), "text changed during composition");
   mSelection.MarkDirty();
 
-  if (mSink && 0 != (mSinkMask & TS_AS_TEXT_CHANGE)) {
+  if (!mSink || !(mSinkMask & TS_AS_TEXT_CHANGE)) {
+    return NS_OK;
+  }
+
   if (aStart >= INT32_MAX || aOldEnd >= INT32_MAX || aNewEnd >= INT32_MAX) {
     PR_LOG(sTextStoreLog, PR_LOG_ERROR,
            ("TSF: 0x%p   nsTextStore::OnTextChangeInternal() FAILED due to "
@@ -3085,6 +3097,18 @@ nsTextStore::OnTextChangeInternal(uint32_t aStart,
     return NS_OK;
   }
 
+  // Some TIPs are confused by text change notification during composition.
+  // Especially, some of them stop working for composition in our process.
+  // For preventing it, let's commit the composition.
+  if (mComposition.IsComposing()) {
+    PR_LOG(sTextStoreLog, PR_LOG_ALWAYS,
+           ("TSF: 0x%p   nsTextStore::OnTextChangeInternal(), "
+            "committing the composition for avoiding making TIP confused...",
+            this));
+    CommitCompositionInternal(false);
+    return NS_OK;
+  }
+
   TS_TEXTCHANGE textChange;
   textChange.acpStart = static_cast<LONG>(aStart);
   textChange.acpOldEnd = static_cast<LONG>(aOldEnd);
@@ -3096,7 +3120,7 @@ nsTextStore::OnTextChangeInternal(uint32_t aStart,
           "acpNewEnd=%ld })...", this, textChange.acpStart,
           textChange.acpOldEnd, textChange.acpNewEnd));
   mSink->OnTextChange(0, &textChange);
-  }
+
   return NS_OK;
 }
 
@@ -3105,28 +3129,45 @@ nsTextStore::OnSelectionChangeInternal(void)
 {
   PR_LOG(sTextStoreLog, PR_LOG_DEBUG,
          ("TSF: 0x%p nsTextStore::OnSelectionChangeInternal(), "
-          "mSink=0x%p, mSinkMask=%s, mIsRecordingActionsWithoutLock=%s",
+          "mSink=0x%p, mSinkMask=%s, mIsRecordingActionsWithoutLock=%s, "
+          "mComposition.IsComposing()=%s",
           this, mSink.get(), GetSinkMaskNameStr(mSinkMask).get(),
-          GetBoolName(mIsRecordingActionsWithoutLock)));
+          GetBoolName(mIsRecordingActionsWithoutLock),
+          GetBoolName(mComposition.IsComposing())));
 
   if (IsReadLocked()) {
     return NS_OK;
   }
 
-  NS_ASSERTION(!mComposition.IsComposing(),
-               "selection changed during composition");
   mSelection.MarkDirty();
 
-  if (mSink && 0 != (mSinkMask & TS_AS_SEL_CHANGE)) {
+  if (!mSink || !(mSinkMask & TS_AS_SEL_CHANGE)) {
+    return NS_OK;
+  }
+
+  // Some TIPs are confused by selection change notification during composition.
+  // Especially, some of them stop working for composition in our process.
+  // For preventing it, let's commit the composition.
+  if (mComposition.IsComposing()) {
+    PR_LOG(sTextStoreLog, PR_LOG_ALWAYS,
+           ("TSF: 0x%p   nsTextStore::OnSelectionChangeInternal(), "
+            "committing the composition for avoiding making TIP confused...",
+            this));
+    CommitCompositionInternal(false);
+    return NS_OK;
+  }
+
+  if (!mIsRecordingActionsWithoutLock) {
     PR_LOG(sTextStoreLog, PR_LOG_ALWAYS,
            ("TSF: 0x%p   nsTextStore::OnSelectionChangeInternal(), calling "
             "mSink->OnSelectionChange()...", this));
-    if (!mIsRecordingActionsWithoutLock) {
     mSink->OnSelectionChange();
   } else {
+    PR_LOG(sTextStoreLog, PR_LOG_ALWAYS,
+           ("TSF: 0x%p   nsTextStore::OnSelectionChangeInternal(), pending "
+            "a call of mSink->OnSelectionChange()...", this));
     mNotifySelectionChange = true;
   }
-  }
   return NS_OK;
 }