DevTools: Always have some content in a TextPrompt

third_party/WebKit/Source/devtools/front_end/ui/textPrompt.css

Index: third_party/WebKit/Source/devtools/front_end/ui/textPrompt.css
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/textPrompt.css b/third_party/WebKit/Source/devtools/front_end/ui/textPrompt.css
index 2996f8c5148a2ea6c800c331a523702194073723..49d08cb8907b1408f329b9e2b4718f9b6d643ee6 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/textPrompt.css
+++ b/third_party/WebKit/Source/devtools/front_end/ui/textPrompt.css
@@ -45,6 +45,12 @@
     color: rgb(128, 128, 128);
 }
 
+::content .text-prompt:empty::after {
+    content: '\00A0';
+    width: 0;
+    display: block;
+}
+
 .text-prompt-editing ::content br {
     display: none;
 }