Fix for Dark theme not readable

CHANGELOG.md

@@ -18,6 +18,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 ### Changed
 
+- Change in the color of the selection entries and the color of the summary in the Import Entries Dialog. [#7927](https://github.com/JabRef/jabref/issues/7927)
 - We upgraded to Lucene 9.2 for the fulltext search.
   Thus, the now created search index cannot be read from older versions of JabRef anylonger.
   ⚠️ JabRef will recreate the index in a new folder for new files and this will take a long time for a huge library.

src/main/java/org/jabref/gui/Base.css

@@ -98,6 +98,9 @@
     -jr-drag-target: -jr-purple;
     -jr-drag-target-hover: derive(-jr-purple, 80%);
 
+    -js-summary-text-color: #000000;
+    -js-summary-text-color-selected: #000000;
+
     /*
      Here are redefinitions of the default properties of modena. They should in principle all be derived from the
      above colors. Goal should be to make as few as possible direct color-changes to elements and only do this for

src/main/java/org/jabref/gui/Dark.css

@@ -55,6 +55,9 @@
 
     -jr-drag-target: -jr-accent;
     -jr-drag-target-hover: -jr-accent;
+
+    -js-summary-text-color: derive(-fx-light-text-color, 70%);
+    -js-summary-text-color-selected: derive( -fx-dark-text-color, 70%);
 }
 
 #previewBody {

src/main/java/org/jabref/gui/importer/ImportEntriesDialog.css

@@ -11,10 +11,15 @@
     /*-fx-padding: 0.5em 0em 0.5em 0em;*/
 }
 
-.list-cell {
+.list-cell .summary > Text {
     -fx-padding: 0.5em 0 1em 0.5em;
+    -fx-fill: -js-summary-text-color;
 }
 
 .list-cell:entry-selected {
-    -fx-background-color: derive(-jr-selected, 60%);
+    -fx-background-color: derive(-jr-selected, 35%);
+}
+
+.list-cell:entry-selected .summary > Text {
+    -fx-fill: js-summary-text-color-selected;
 }