Fix according to Ruslan

Author: Yubo-Cao

CHANGELOG.md

@@ -35,7 +35,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - We added an "Open example library" button to Welcome Tab. [#13014](https://github.com/JabRef/jabref/issues/13014)
 - We added automatic detection and selection of the identifier type (e.g., DOI, ISBN, arXiv) based on clipboard content when opening the "New Entry" dialog [#13111](https://github.com/JabRef/jabref/pull/13111)
 - We added support for import of a Refer/BibIX file format. [#13069](https://github.com/JabRef/jabref/issues/13069)
-- We added markdown rendering and copy-paste capabilities to AI chat responses. [#12234](https://github.com/JabRef/jabref/issues/12234)
+- We added markdown rendering and copy capabilities to AI chat responses. [#12234](https://github.com/JabRef/jabref/issues/12234)
 - We added a new `jabkit` command `pseudonymize` to pseudonymize the library. [#13109](https://github.com/JabRef/jabref/issues/13109)
 - We added functionality to focus running instance when trying to start a second instance. [#13129](https://github.com/JabRef/jabref/issues/13129)
 - We added a highlighted diff regarding changes to the Group Tree Structure of a bib file, made outside JabRef. [#11221](https://github.com/JabRef/jabref/issues/11221)

jabgui/src/main/java/org/jabref/gui/util/MarkdownTextFlow.java

@@ -320,15 +320,23 @@ private void visit(FencedCodeBlock codeBlock) {
              * ``` -> contains content `\npublic class HelloWorld { ... }\n\n`
              * Therefore, we need to remove the first and last characters.
              */
-            addTextNode(content.substring(1, content.length() - 2), codeBlock, "markdown-code-block");
+            String processedContent = content;
+            if (content.length() >= 3 && content.startsWith("\n") && content.endsWith("\n\n")) {
+                processedContent = content.substring(1, content.length() - 2);
+            }
+            addTextNode(processedContent, codeBlock, "markdown-code-block");
             previousBlock = codeBlock;
         }
 
         private void visit(IndentedCodeBlock codeBlock) {
             addNewlinesBetweenBlocks(codeBlock);
             String content = codeBlock.getContentChars().toString();
             // NOTE: Similar to FencedCodeBlock, Flexmark always appends \n at the beginning and \n\n at the end.
-            addTextNode(content.substring(1, content.length() - 2), codeBlock, "markdown-code-block");
+            String processedContent = content;
+            if (content.length() >= 3 && content.startsWith("\n") && content.endsWith("\n\n")) {
+                processedContent = content.substring(1, content.length() - 2);
+            }
+            addTextNode(processedContent, codeBlock, "markdown-code-block");
             previousBlock = codeBlock;
         }
 

jabgui/src/main/resources/org/jabref/gui/Base.css

@@ -262,9 +262,9 @@
     -jr-header-height: 3em;
 
     /* AI chat style */
-    -jr-ai-message-user: -jr-accent;
+    -jr-ai-message-user: derive(-jr-accent, 50%);
     -jr-ai-message-user-border: -jr-theme;
-    -jr-ai-message-ai: -jr-accent;
+    -jr-ai-message-ai: derive(-jr-accent, 80%);
     -jr-ai-message-ai-border: -jr-theme;
     -jr-ai-message-error: -jr-error;
     -jr-ai-message-error-border: derive(-jr-error, -40%);