Issue #2104 - Part 2: Indicate if a label was cropped via the "_is_cropped" attribute

1 files changed, 7 insertions, 0 deletions

diff --git a/layout/xul/nsTextBoxFrame.cpp b/layout/xul/nsTextBoxFrame.cpp
index 4c420f9323..755668d806 100644
--- a/layout/xul/nsTextBoxFrame.cpp
+++ b/layout/xul/nsTextBoxFrame.cpp
@@ -629,6 +629,10 @@ nsTextBoxFrame::CalculateTitleForWidth(nsRenderingContext& aRenderingContext,
 {
     DrawTarget* drawTarget = aRenderingContext.GetDrawTarget();
 
+    if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::_is_cropped)) {
+        mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_is_cropped, true);
+    }
+
     if (mTitle.IsEmpty()) {
         mCroppedTitle.Truncate();
         return 0;
@@ -831,6 +835,9 @@ nsTextBoxFrame::CalculateTitleForWidth(nsRenderingContext& aRenderingContext,
         break;
     }
 
+    mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::_is_cropped,
+                      NS_LITERAL_STRING("true"), true);
+
     return nsLayoutUtils::AppUnitWidthOfStringBidi(mCroppedTitle, this, *fm,
                                                    aRenderingContext);
 }